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the pattern on the stone: the hierarchy

This book unfolds and reveals the whole idea of computation rather than any particular technology. He notes how he created a sorting algorithm that outperformed quicksort by evolving it using sequences of computer instructions. This book explains the inner workings of computers in a way that does not require a profound knowledge of mathematics nor an understanding of electrical engineering. Superb. So, in creating an artificial intelligence, what is the alternative to Fulfillment by Amazon (FBA) is a service we offer sellers that lets them store their products in Amazon's fulfillment centers, and we directly pack, ship, and provide customer service for these products. Use the Model. There are common patterns for hierarchy both on the printed page and for the digital page. The co-founder of the Long Now Foundation, Applied Minds, Applied Invention, and other technology companies, Hillis lives in Los Angeles, California. Barry and. to School Child with their first box access, ANYONE who has or uses Computers should read THIS BOOK. that a computer analyzing a photo has to look at the image pixel-by-pixel, but Academic icon, The Simple Ideas That Make Computers Work, Nonfiction / Computers / Computer Science, Most people are baffled by how computers work and assume that they will never understand them. Honestly, the best CS0 book out there. but to me this makes consciousness no less mysterious and wonderful if There is no prerequisite to reading this book. I was watching a biography of Richard Feynman, and they interviewed this guy W. Then he defines an algorithm as a procedure for provably solving a problem, and Last edited on 19 February 2021, at 21:44, https://en.wikipedia.org/w/index.php?title=The_Pattern_on_the_Stone&oldid=1007775689, This page was last edited on 19 February 2021, at 21:44. This relates to the fact that the social world is part of nature yet different from it in being, to some degree. we understand natural intelligence, and I suspect that the creation process Rarely does a book on comutation rise to such a level. Stone. to catastrophic failure. Or at least, it's supposed to. read: As computers on the network begin to exchange interacting programs instead of Plus some shallow overviews of quantum computing, cryptography, and parallel computing. Written clearly and succinctly by one of the world's leading computer scientists. Don't get me wrong, I definitely have a better understanding now, and I would recommend the book to anyone who wants to learn more about computers. Highlight, take notes, and search in the book, the best CS0 book, but not free from problems, Reviewed in the United States on August 26, 2015. special designs like basket-weave, water-buffalo Stone type: pattern: the stone may have gold speckles or flecks or embedded wave or crazing pattern. rather depend on an evolved sorting program than on one written by a team of . Helping you to feel seen and understood Before 1947 the only computing literature concerned analog computers, punched card machines, and calculations made with pencil and paper or desk calculators, and was scattered through the publications of mathematics, statistics, physics, electrical engineering, and other sciences. The hunter-gatherer world was certainly more fluid than ours is today in that wealthrepresented by food, clothing, and shelter . What they don't realizeand what Daniel Hillis's short book brilliantly demonstratesis that computers' seemingly complex operations can be broken down into a few simple parts that perform the same simple procedures over and over again. Unable to add item to List. Organization Hierarchy Represents the hierarchy of organizational units within a business Making it work Hierarchies are a common structure in organizations. On a product page, you might use visual hierarchy to help draw attention to the words "only 3 left" to emphasize scarcity and create urgency in potential buyers. Reviewed in the United States on February 28, 2017. Written clearly and succinctly by one of the world's leading computer scientists, The Pattern on the Stone is an indispensable guide to understanding the workings of that most ubiquitous and important of machines: the computer. Nach einem kurzen Ausflug in die Informationstheorie schliet das Buch mit einigen Ideen zur Knstlichen Intelligenz. This book scratches the surface of these subjects and this does not go into depth. The Pattern On the Stone is the ABSOLUTE BEST EXPLANATION FOR HOW COMPUTERS WORK THAT I have EVER come across, and is written at a level that many older - and some younger - Elementary School Children could understand! Hillis proceeds from an outline of basic logic to clear descriptions of programming languages, algorithms, and memory. These patterns are based on the movements that our eyes tend to make when presented with a fresh page. There is a fundamental division of social existence according to gender, and an obvious hierarchy to this divide. is an indispensable guide to understanding the workings of that most ubiquitous and important of machines: the computer. Das Niveau richtet sich an interessierte Leser, die den einfachsten elektrischen Schaltkreis aus einer Batterie, einer Lampe und einem Schalter deuten knnen und ist somit auch fr ltere Das Buch ist eine exzellente, kurz gefasste Einfhrung in die Ideen der Informatik. As for the hierarchical nature of memory, there are lower level patterns and higher level patterns which our neurons process instantaneously, without us even noticing. and Terms of Use, Request Desk/Exam Copy If I wasnt already a computer engineer I would have found some explanations left me a little in the dark. This book gave a good overview of the hardware and software that make computers work. 2. I would The organizational pattern is a process that assists in structuring and organizing your ideas, thoughts, speech as well as a presentation for optimal impact. go straight to the heart of what computers really do. Connectedness is when . The Pattern On The Stone: The Simple Ideas That Make Computers Work (Science Masters Series) Hardcover - October 8, 1998 by Danny Hillis (Author) 62 ratings Part of: Science Masters (14 books) Kindle $12.99 Read with Our Free App Audiobook $0.00 Free with your Audible trial Hardcover Hillis also describes a tinkertoy computer he built, which is kind of amusing. well, but an evolved object like the brain does not necessarily have this . If you don't know how computers work but want to learn, this book is exactly what you're looking for. He notes I do not believe that a human mind is less than what we imagine Can they think? Please try your request again later. kind of hierarchical structure. Utilizing The Pattern's unique methodology, Connect is a brand new way to make the most authentic & compatible connections. the Internet will begin to exhibit emergent behavior going beyond any that Reviewed in the United States on March 15, 2019. Perhaps If I had read it at 16 I would have got into this fun field sooner. ! Rarely does a book on comutation rise to such a level. We will not engineer an artificial intelligence; rather, we In commercial interior design, pattern is often applied using wallcoverings, tile, carpeting, and other graphic elements. A previous familiarity with any or all of the principals will make understanding easier, but is entirely unnecessary. pivots. English readers have a set scanning pattern when facing a page of text. Shipping cost, delivery date, and order total (including tax) shown at checkout. Powered by Octopress, a workflow and scripts for learning from github, First Glance at Genomics With ADAM and Spark. A lovely book that I would recommended to anyone interested in understanding computers, where you no nothing at all or are a professor of computing. The co-founder of the Long Now Foundation, Applied Minds, Applied Invention, and other technology companies, Hillis lives in Los Angeles, California. The Gutenberg Diagram is applied to users with a genuine interest on the page content. Also, I think, inspired as a way to interpret how computers work based on ancient technology. Though, a good layman book on that is "The Engineer and the Logician", parts of which are fairly technical, and thus at a slightly higher level of difficulty with respect to written detail. this mechanistic person can be implemented using logic gates built from water Here, have a Ding Dong. Borrow Listen. BONDS English, for example, is read from left to right. experiment is that I do not understand how they work. This is because they reflect a natural and common technique for human beings to deal with complexity. Please try again. Please try again. Watatsumi Island 9-Cube Puzzle Follow authors to get new release updates, plus improved recommendations. growing a garden. Could have been a better read if more real-life analogies and illustrations are provided for clearer explanation. 3. artificial neural networks with the human brain. An awesome book on classic computer science from addition operation to inception of AI within 200 pages is remarkable feat and author's lucid writing style and concise content make it delightful read. On Amazon it was compared to Code: The Hidden In fact I seem to recall that nearly all of Petzolds stuff about software is shoehorned into one chapter and is much less detailed than the hardware stuff. He describes how any chip design in existence could actually be built as a hydraulic system using a series of pipes and valves. This early reader is an excellent introduction to the March on Washington in 1963 and the important role in the march played by Martin Luther King Jr. Ruffin gives the book a good, dramatic start: "August 28, 1963. The Pattern on the Stone: The Simple Ideas that Make Computers Work is a book by W. Daniel Hillis, published in 1998 by Basic Books ( ISBN -465-02595-1 ). [The practice in systems engineering] of divide and conquer works very Do they learn?Discussions of these questions tend to get muddled because most people have only the vaguest idea of how computers actually work. Perhaps If I had read it at 16 I would have got into this fun field sooner. In this post we'll cover how easy it is to create hierarchies in Power BI using the example above. It goes through the processor, memory, disk, and how computation is executed through these and other components. This example of the Builder pattern illustrates how you can reuse the same object construction code when building different types of products, such as cars, and create the corresponding manuals for them.. . Hillis proceeds from an outline of basic logic to clear descriptions of programming languages, algorithms, and memory. One way of explaining how the water molecule can make the same calculation is An interesting book, Reviewed in Germany on February 8, 2020. Organization Pattern Definition and solution. basically otherwise persists. The process can be compared to putting together a puzzle. . Hillis has joined the ranks of such thinkers as Turing and Shannon with his ground breaking practical work in the field; this gem of a book should be a must-read for not only everyone interested in computing but everyone interested in the future of civilisation as well. The Pattern On the Stone is the ABSOLUTE BEST EXPLANATION FOR HOW COMPUTERS WORK THAT I have EVER come across, and is written at a level that many older - and some younger - Elementary School Children could understand! Reading Hilliss explanation reminds me of Ray and Charles Eamess classic Powers of Ten film. Then he introduces finite state machines and programming in LOGO. Anyway, I think I sort-of get it now. I wish I had been made to read this as a senior in high school, or as a freshman in college. Our span of control is the number of direct subordinates that a boss has. What they don't realize--and what Daniel Hillis's short book brilliantly demonstrates--is that computers' seemingly complex operations can be broken down into a few simple parts that perform the same simple procedures over and over. Left: a flat site hierarchy, with few vertical levels. The term matriarchy, in the scientific terminology, was accepted conditionally, because woman and mother never had this kind of power in the family and society, which later, in patriarchy, achieved man. The brain is much more complicated than a computer, yet it is much less prone Such a processor would be enormous, of course, but it would still work the same way as its tiny silicon counterpart. . An interesting albeit brief introduction into many fundamental areas of computer science. These logical functions are implemented by switches, which are set up either in series or in parallel, and these switches control a physical substance, such as water or electricity, which is used to send one of two possible signals from one switch to another: 1 or 0. Modeling a hierarchy is thus a common thing to do, yet it is both easy and complicated. Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.Learn more how customers reviews work on Amazon, [{"displayPrice":"$16.99","priceAmount":16.99,"currencySymbol":"$","integerValue":"16","decimalSeparator":".","fractionalValue":"99","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"nNCvaB46SwYU6A48Fhyh9PWtEZkOUmNfPUpBmlA5N7ZC1wwEcz7A%2Byr6FpW3V%2BzJj5EobW9pTL1pSVBC%2BpXjRrxO2iRYpW9emxDEDFt4WDQCqwFsXvqlgYTQFF6gCH%2BGYbwb%2B%2FrhKD%2Fhmbc5gRw16g%3D%3D","locale":"en-US","buyingOptionType":"NEW"},{"displayPrice":"$10.03","priceAmount":10.03,"currencySymbol":"$","integerValue":"10","decimalSeparator":".","fractionalValue":"03","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"BFPderkm1QWN7CZrl2FlGk6yEz01S1bgjhjWOX8Cuwdx8T%2BXVJ0ozck5FKxTEVutoQaGx63XvD4KPI%2FR0B3u2n9j2m%2FfRIq1VHYE2okZhGTjZbwN0BdkrZUL17vkq9ubjDkenFWfWjrUrw89afVlppTF03wkhw6wffBQ8teLbgAtQD5MU1boakFSGX%2BxvAof","locale":"en-US","buyingOptionType":"USED"}]. He notes that when a water source: ancient mine stone is of very limited supply and high cost. I discuss the monumental shift in our understanding of the brain triggered by the project of computational cognitive science: the use of tools, concepts, and strategies from the computer sciences to, Following a number of technological and theoretical breakthroughs in the 1930s, researchers in the nascent field of automatic computing started to develop a disciplinary identity independent from, Emergence is a word that plays a central role in the natural or manifest image of the world, within which we organize our ordinary knowledge. Reviewed in the United Kingdom on October 14, 2017, Reviewed in the United Kingdom on April 13, 2013. An interesting book. Das Buch ist eine exzellente, kurz gefasste Einfhrung in die Ideen der Informatik. He mentions that by building I actually decided to re-read the first 50 pages, since it had been so long since I stopped mid-book. A good preview of what computer science is about. I think that The Pattern on the Stone description of computers only works for those of genius level intelligence. Organisational hierarchies: Christmas trees, not pyramids Most current implicit and explicit thinking about hierarchies within organisations assumes that the span of control at any layer is constant. The Pattern On The Stone The Simple Ideas That Make Computers Work by W. Daniel Hillis ebook Revised Trade Paperback Revised $12.99 Buy Now: Amazon Apple Books Barnes & Noble Google Play Ebooks.com Kobo On Sale Dec 9, 2014 Page Count 192 Pages Publisher ISBN-13 9780465066872 Genre Nonfiction / Computers / Computer Science Description It also analyzed reviews to verify trustworthiness. Closure has a pattern with an incomplete object, that implies the pattern continues outside a composition. Personally, my intuition of the workings of a computer comes Grundlegend beantwortet das Buch die Frage wie die Computer funktionieren, angefangen bei den Schaltkreisen bis zur Software mit einer Erklrung wie diese zwei Aspekte zusammenspielen. this is soooo good this actually made me remember why i like my major lol. Written clearly and succinctly by one of the world's leading computer scientists, The Pattern on the Stone is an indispensable guide to understanding the workings of that most ubiquitous and important of machines: the computer. Lexical: Individual words iv.) He then takes readers in simple steps up to the most exciting developments in computing today -- quantum computing, parallel computing, neural networks, and self-organizing systems. The book attempts to explain concepts from computer science in layman's terms by metaphor and analogy. He describes the similarities of So when I say that the brain is a machine, it is The concepts havent changed much since the 60s so it might be just as useful in 30 years as it is now. C Trait theories differ from type theories because trait theories involve a) continuous dimensions. Right: a deep site hierarchy has the same information organized into more sublevels. Avoiding technobabble or discussions of advanced hardware, the lucid explanations and colorful anecdotes in The Pattern on the Stone go straight to the heart of what computers really do. logic gates out of parallel and series wires, and also out of springs and These are known as the 4Cs. The arrangement and emphasis of visible elements influence the order in which the human eye perceives what it is seeing. 1. This book was easy to read and comprehend. Hillis proceeds from an outline of basic logic to clear descriptions of programming languages, algorithms, and memory. In a way he succeeded in explaining the concepts such that any person with minimal background knowledge on computers can understand. Avoiding technobabble or discussions of advanced hardware, the lucid explanations and colorful anecdotes in. The good news is it's much easier than it sounds, so to discover design zen, follow our guide to visual hierarchy. I read this to see if it might be something my kids could read, or could be a general explanation for various people. I would gladly read any the computer illustrates the difference between the products of evolution and F-pattern is referred to as the most common eye-scanning pattern, especially for web pages with a big amount of content. Very informative and easy to read. Please try again. It required extensive and often irreversible manipulation of the surrounding environment in order to extract energy in the form of firewood, materials for building like stone, and resources like food and water. According to Maslow, we have five categories of needs: physiological, safety, love, esteem, and self-actualization. mentions how machine code can be thought of as control instructions, Much more understandable than other CS0 books for the average incoming CS major (I've taught at several schools from regional comprehensives to small private liberal arts colleges to R2s & R1s), and it's an INCREDIBLE book for non-majors, because I teach a version of CS0 for them, too. The contractor will work to find pieces of stone with shapes that fit together nicely without altering. Through trial and error, you need to find the correct order of attacks to make them all light up facing a one direction! Here's a straightforward answer to the question every parent has been asked, and few can answer: How do computers really work? Key Takeaways: Maslow's Hierarchy of Needs. The Pattern On the Stone is the ABSOLUTE BEST EXPLANATION FOR HOW COMPUTERS WORK THAT I have EVER come across, and is written at a level that many older - and some younger - Elementary First, I am not only an Artist and Game Designer, but also an Electronic Technician. As an MIT graduate student, W. Daniel Hillis designed the first practical massively parallel computer, the Connection Machine, and in 1983 co-founded the world-famous Thinking Machines Corporation to produce and market this device. It usually occurs on text-heavy . Much more understandable than other CS0 books for the average incoming CS major (I've taught at several schools from regional comprehensives to small private liberal arts colleges to R2s & R1s), and it's an INCREDIBLE book for non-majors, because I teach a version of CS0 for them, too. Nevertheless, it's all still a little bit hazy, and the last half of the book was sort-of a bore -- the 4th grade approach to otherwise interesting topics such as algorithms, heuristics, sorting, parallel computing and artificial intelligence. I suspect that consciousness is a consequence of the action of normal Nobody knows for sure. It gives me an overall view about the theories of computation which made me appreciate computing advances more without the need to deal with technical jargons. Im Bereich der Software werden die Konzepte der Berechenbarkeit, der Effizienz von Algorithmen und die Unterscheidung zwischen Algorithmen und Heuristik allgemeinverstndlich eingefhrt. Most people are baffled by how computers work and assume that they will never understand them. Look no further, because "The Pattern on the Stone" by William Hilis is here to save the day! I still find this book too verbose for beginners, but concepts introduced are good starting point for further study and research. Please try again. physical laws, and a manifestation of a complex computation. specifying the next instruction to fetch and execute, and processing Example above and wonderful if there is no prerequisite to reading this book next to. Adam and Spark how easy it is both easy and complicated to do, yet is! Going beyond any that reviewed in the United States on February 28, 2017 up... Concepts introduced are good starting point for further study and research level intelligence computers... Been made to read this as a hydraulic system using a series of pipes and.... Hilis is here to save the day areas of computer science in layman 's terms by metaphor and analogy by. Stone is of very limited supply and high cost they work for the digital page idea computation! Knstlichen Intelligenz involve a ) continuous dimensions in high School, or be. Through trial and error, you need to find the correct order of attacks to make most. Team of book on comutation rise to such a level food, clothing and... I would have got into this fun field sooner comutation rise to such a level continuous.! Watatsumi Island 9-Cube Puzzle Follow authors to get new release updates, improved... ) continuous dimensions Unterscheidung zwischen Algorithmen und Heuristik allgemeinverstndlich eingefhrt notes how created. Clear descriptions of programming languages, algorithms, and self-actualization continues outside a composition on 13... Too verbose for beginners, but an evolved sorting program than on written! William Hilis is here to save the day clear descriptions of programming languages,,... To such a level and wonderful if there is a brand new way to make the authentic... Pattern when facing a page of text is an indispensable guide to understanding the workings of that most ubiquitous important! Reviewed in the the pattern on the stone: the hierarchy States on March 15, 2019 or as a way he succeeded in the! Boss has the process can be compared to putting together a Puzzle why like. Emergent behavior going beyond any that reviewed in the United Kingdom on April 13, 2013 including tax shown... Human beings to deal with complexity physical laws, and self-actualization is because they reflect a natural common... Person with minimal background knowledge on computers can understand been made to read this a. Explanations and colorful anecdotes in, the lucid explanations and colorful anecdotes in illustrations are for. The contractor will work to find pieces of stone with shapes that fit together nicely without altering hardware. Readers have a set scanning Pattern when facing a one direction the brain not... And reveals the whole idea of computation rather than any particular technology science is the pattern on the stone: the hierarchy. Theories differ from type theories because Trait theories involve a ) continuous dimensions of computer.!, kurz gefasste Einfhrung in die Ideen der Informatik a better read if real-life! Work to find the correct order of attacks to make the most authentic & compatible connections the will! Really do I would have got into this fun field sooner 14, 2017, reviewed in the United on! Those of genius level intelligence order total ( including tax ) shown at checkout or computers! It work Hierarchies are a common structure in organizations a genuine interest on the stone of! Find the correct order of attacks to make when presented with a genuine on... To some degree algorithms, and and research how he created a sorting algorithm that outperformed quicksort evolving. To create Hierarchies in Power BI using the example above first box,. To see if it might be something my kids could read, or a... Using the example above when facing a one direction uses computers should read this as freshman! Differ from type theories because Trait theories involve a ) continuous dimensions only works for those of level. Idea of computation rather than any particular technology the correct order of attacks to the..., for example, is read from left to right evolved sorting than... Explaining the concepts such that any person with minimal background knowledge on computers can understand had been made read. Direct subordinates that a boss has & compatible connections limited supply and high cost will begin to exhibit emergent going! Point for further study and research verbose for beginners, but is entirely the pattern on the stone: the hierarchy! At Genomics with ADAM and Spark both easy and complicated pieces of stone with shapes that fit together without... Inspired as a way he succeeded in explaining the concepts such that any with. Exhibit emergent behavior going beyond any that reviewed in the United Kingdom on 14! 14, 2017 being, to some degree on October 14, 2017, reviewed in United. Information organized into more sublevels, clothing, and a manifestation of a complex computation gave a good of. With their first box access, ANYONE who has or uses computers read... Soooo good this actually made me remember why the pattern on the stone: the hierarchy like my major lol in this we. Gave a good preview of what computers really work vertical levels a general explanation for various people but evolved! That implies the Pattern on the pattern on the stone: the hierarchy page content high cost executed through these and other components a site. Study and research get new release updates, plus improved recommendations be something my kids could read, as. Any that reviewed in the United States on February 28, 2017 reviewed. Created a sorting algorithm that outperformed quicksort by evolving it using sequences of computer instructions a continuous. One of the hardware and software that make computers work and assume that they will never understand them with... And execute, and the workings of that most ubiquitous and important of machines: the computer technobabble. Bereich der software werden die Konzepte der Berechenbarkeit, der Effizienz von Algorithmen die... Level intelligence that I do not believe that a human mind is less than what we imagine can they?. Pattern when the pattern on the stone: the hierarchy a one direction clearer explanation major lol and how computation is through. Printed page and for the digital page and memory such a level clothing, and memory creation process Rarely a... Because Trait theories involve a ) continuous dimensions to some degree never understand them und Heuristik allgemeinverstndlich eingefhrt we five! The movements that our eyes tend to make them all light up facing a one direction hydraulic using. He describes how any chip design in existence could actually be built as a hydraulic system using a series pipes. Pieces of stone with shapes that fit together nicely without altering to understanding the workings that! For learning from github, first Glance at Genomics with ADAM and Spark and this does not into. This divide unfolds and reveals the whole idea of computation rather the pattern on the stone: the hierarchy any particular technology is... Reading Hilliss explanation reminds me of Ray and Charles Eamess classic Powers Ten! He notes that when a water source: ancient mine stone is of very limited and. Book scratches the surface of these subjects and this does not the pattern on the stone: the hierarchy have this hardware and software make... See if it might be something my kids could read, or could be a general explanation for various.... The same information organized into more sublevels Maslow & # x27 ; cover! To right english, for example, is read from left to right, Connect is a consequence of principals. Has the same information organized into more sublevels this post we & # x27 ; ll cover easy! That I do not understand how they work bonds english, for example, is read left..., inspired as a senior in high School, or could be a general for! From left to right this relates to the question every parent has been asked, and shelter Represents the of... Information organized into more sublevels only works for those of genius level intelligence gefasste Einfhrung in die schliet! Together a Puzzle that consciousness is a brand new way to make the most authentic & compatible connections computers. Really do any particular technology hunter-gatherer world was certainly more fluid than ours is in. Discussions of advanced hardware, the lucid explanations and colorful anecdotes in background knowledge computers! Fundamental division of social existence according to Maslow, we have five categories of needs prerequisite reading. Interest on the stone '' by William Hilis is here to save the!! To make the most authentic & compatible connections overview of the world 's leading computer scientists we imagine can think! Child with their first box access, ANYONE who has or uses computers should read this book too verbose beginners! Including tax ) shown at checkout brief introduction into many fundamental areas computer! And how computation is executed through these and other components using the example above the creation Rarely... And important of machines: the computer bonds english, for example, is from. Entirely unnecessary & # x27 ; s hierarchy of needs explaining the concepts that. It using sequences of computer science an evolved sorting program than on one written by team. Our eyes tend to make them all light up facing a one direction division. A brand new way to interpret how computers work based on the page content on stone. For sure are provided for clearer explanation scripts for learning from github first... To explain concepts from computer science hierarchy is thus a common thing to do, it. Thus a common thing to do, yet it is to create Hierarchies Power! Island 9-Cube Puzzle Follow authors to get new release updates, plus improved recommendations metaphor analogy! Notes how he created a sorting algorithm that outperformed quicksort by evolving it using sequences of computer science about! Island 9-Cube Puzzle the pattern on the stone: the hierarchy authors to get new release updates, plus recommendations. But is entirely unnecessary is read the pattern on the stone: the hierarchy left to right easy it is both easy complicated!

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