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(it’s a lie)

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Abstractions

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“Developers (sometimes) need to play with illusions” Yukihiro “Matz” Matsumoto

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“Anything that is in the world when you’re born is normal and ordinary and is just a natural part of the way the world works. Anything that's invented between when you’re fifteen and thirty-five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you're thirty-five is against the natural order of things” –Douglas Adams

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Computer Science

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Colour Perception

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Conclusion spoiler alert

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Abstraction happens in our minds

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Abstractions shape how we perceive things

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Changing abstractions is a basic principle of innovation and progress

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Abstraction is the basis of Computer Science

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Abstraction is the basis of Computer Science

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Trichromacy

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Patterns and Algorithms

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?

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?

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Is magenta real?

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# FF00FF

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Data Abstraction

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“Dataless Programming” RM Balzer - 1967

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Space

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Wait, what?

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Are we still talking about abstraction?

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# FF00FF

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Control Abstraction

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Subroutines

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“Go To Statement Considered Harmful” Edsger Dijkstra, 1968

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“Protection in Programming Languages" James H. Morris Jr., 1973

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You should be able to reason about modules in isolation

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“Global Variables Considered Harmful” W.A. Wulf, M. Shaw, 1973

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Tetrachromacy

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The dimensionality of color vision in carriers of anomalous trichromacy Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, UK Gabriele Jordan Departments of Medicine and Genome Sciences, University of Washington, Seattle, USA Samir S. Deeb Department of Experimental Psychology, University of Cambridge, Cambridge, UK Jenny M. Bosten Department of Experimental Psychology, University of Cambridge, Cambridge, UK J. D. Mollon Some 12% of women are carriers of the mild, X-linked forms of color vision deficiencies called “anomalous trichromacy.” Owing to random X chromosome inactivation, their retinae must contain four classes of cone rather than the normal three; and it has previously been speculated that these female carriers might be tetrachromatic, capable of discriminating spectral stimuli that are indistinguishable to the normal trichromat. However, the existing evidence is sparse and inconclusive. Here, we address the question using (a) a forced-choice version of the Rayleigh test, (b) a test using multidimensional scaling to reveal directly the dimensionality of the participants’ color space, and (c) molecular genetic analyses to estimate the X-linked cone peak sensitivities of a selected sample of strong candidates for tetrachromacy. Our results suggest that most carriers of color anomaly do not exhibit four-dimensional color vision, and so we believe that anomalous trichromacy is unlikely to be maintained by an advantage to the carriers in discriminating colors. However, 1 of 24 obligate carriers of deuteranomaly exhibited tetrachromatic behavior on all our tests; this participant has three well-separated cone photopigments in the long- wave spectral region in addition to her short-wave cone. We assess the likelihood that behavioral tetrachromacy exists in the human population. Keywords: color vision, psychophysics, human, tetrachromacy, anomalous trichromacy Citation: Jordan, G., Deeb, S. S., Bosten, J. M., & Mollon, J. D. (2010). The dimensionality of color vision in carriers of anomalous trichromacy. Journal of Vision, 10(8):12, 1–19, http://www.journalofvision.org/content/10/8/12, doi:10.1167/10.8.12. Journal of Vision (2010) 10(8):12, 1–19 http://www.journalofvision.org/content/10/8/12 1

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2-3% of all women? 12% of all women? 50% of all women?

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Gene on X chromosome OPN1MW and OPN1MW2

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Women could have up to six colour cones

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Mostly dysfunctional

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a few confirmed cases

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Seeing millions of more colours

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Concetta Antico

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Object Oriented Programming

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–Alan Kay “OOP to me means only messaging, local retention and protection and hiding of state- process, and extreme late-binding of all things.”

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Data Abstraction + Control Abstraction = Object Oriented Programming

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Why dysfunctional? (my own unscientific theory)

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We don’t see colours with our eyes

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We see colours with our brain

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Our brain adjusts colours

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We don’t see colours we don’t have an abstract concept for

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When we learn to speak, colour perception switches from left brain side to right brain side

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We make the rules

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Some rules enable good programs (For some definition of good.)

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Single Responsibility Principle

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Liskov Substitution Principle

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Law of Demeter

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SOLID

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Don’t abstract too much, too early

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Strong external abstractions allow weak internal abstractions

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Distributed Applications

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Is magenta a colour?

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Yes

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Inheritance

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Type Hierarchy Liskov Substitution Principle

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Implementation Sharing

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Mixins

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Composition

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Duck Typing

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Are we doing it right?

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Classes ≠ OOP

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Colour and Abstraction

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Himba Tribe (Namibia)

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zuzu: dark shades of blue, red, green and purple vapa: white, some shades of yellow buru: some shades of green and blue dambu: some shades of green, red and brown

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Abstractions and Security

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Most attacks rely on switching up or down abstraction levels

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Abstraction

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Business Logic only exists in our minds

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Object Oriented Programming only exists in our minds

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Colours only exist in our minds

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UI elements only exist in our minds

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Countries only exist in our minds

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Conclusion

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Abstraction happens in our minds

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All abstraction

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Abstractions shape how we perceive things

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Changing abstractions is a basic principle of innovation and progress

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Thank you. @konstantinhaase @rkh_popcorn [email protected]