De onzin van de gulden snede

April 16, 2014

Ik vond een fantastische video van Keith Devlin (Stanford) waarin zeer helder wordt uitgelegd waarom de volks mythe dat de gulden snede correspondeert met “mooi” volledig wordt neergesabeld. (via http://kloptdatwel.nl/)

Ik moet eerlijk zeggen dat ik tot nog toe ook altijd dacht dat mensen die verhouding “mooi” vinden. Maar nu ik er bij stil sta…. wat een onzin inderdaad.

Debunking 10 Golden Ratio Myths from Keith Devlin on Vimeo.

De feiten als samenvatting van de video (video verklaart gehele verhaal):

image 1 “De meeste mensen vinden rechthoeken met de verhoudingen van de gulden snede mooi ….”

ONZIN

Welke rechthoek hiernaast ziet het mooist uit? (antwoord in de video) (de werkelijkheid is complexer)

image 2 “De oude Grieken gebruikten de gulden ratio in hun architectuur” … (Euclid gaf aan hem te berekenen maar de pas vanaf de 15e eeuw kwam het pas in de mode om hem als heilig te beschouwen).

ONZIN

image 3 “De Egyptenaren gebruikten de gulden snede om de Pyramides te maken … “, er is geen enkele aanwijzing dat de Egyptenaren op de hoogte waren van dit getal.

ONZIN

image 4 “In het oude Babylonie werd de gulden snede al gebruikte“

ONZIN

image 5 “Moderne architectuur gebruikt de gulden snede inclusief het gebouw van de United Nations” (los van architecten als Le Corbusier die specifieke ontwerpen maakte op basis ervan)

ONZIN

image 6 “Het menselijk lichaam heeft verhoudingen die gelijk staan de gulden snede verhoudingen”

ONZIN

image 7 “de gouden ratio kan gevonden worden in allerlei kunstwerken”

ONZIN

(zie de video voor wat goede voorbeelden)

image 8 “de Romeine dichter Virgil schreef de Aeneid op basis van de gulden snede”

ONZIN

image 9 “Allerlei componisten gebruiken het in hun werk zoals Mozart”

ONZIN

(op Debussy na: het zou kunnen)

image 10 “De Nautilus Schelp heeft gulden snede afmetingen”

ONZIN

(de Nautilus schelp komt terug als HET voorbeeld van de gulden snede op veel plaatsen) (De logaritmische spiraal die door deze schelp wordt gevormd heeft een hoek van 107,04°, een hoek die noch met de gulden hoek noch met de gulden driehoek in verband valt te brengen.)

image EN NOG VEEL MEER ONZIN

Hoe komt het dat we dit massaal geloven?

Eerder dan 1830 komt de vermelding niet voor. In 1854 publiceerde De Duitser Adolf Zeising  “Neue Lehre von den Proportionen des menschlichen Körpers”. In dat boek verdedigt hij de opvatting dat het ideale menselijke lichaam volledig volgens de guldensnedeverhouding is opgebouwd. Hij gaat zelfs zo ver om het als “universele wet” te definiëren. Hij is daarmee de grondlegger van de mathematische esthetiek.

In de loop der jaren is die volkslegende onderdeel geworden van het collectief denken. Zelfs tot zover dat het wordt gebruikt in de fotografie om significante onderdelen zodanig in de compositie op te nemen dat er een gulden snede verdeling ontstaat en er waanzinnig veel webdesign sites zijn die daar een apart topic over opnemen….

Wat is het dan wel?

De gulden snede is een zeer bijzonder getal waarbij het grootste deel / het kleinste deel de verhouding 1,618 oplevert (phi)

Bij bloemblaadjes, zaden en kelkbladeren heeft evolutie een rol gespeeld: om de meest optimale verdeling te vinden waarbij de blaadjes zoveel mogelijk zonlicht vangen heeft dat uiteindelijk de beste verhouding opgelevert, de gulden hoek (ongeveer 137,5°).

Als we een rechthoek tekenen met verhouding lengte/breedte = phi dan is het een gulden rechthoek. Als hierin een vierkant wordt getekend blijft aan de andere kant opnieuw een gulden rechthoek over. Door dit proces te herhalen ontstaat de gulden spiraal ook wel de Fibonacci spiraal naar de rij van Fibonacci.

De auteur van de video:

Dr. Keith Devlin is a co-founder and Executive Director of the university’s H-STAR institute, a co-founder of the Stanford Media Xresearch network, and a Senior Researcher at CSLI. He is a World Economic Forum Fellow, a Fellow of the American Association for the Advancement of Science, and a Fellow of the American Mathematical Society. His current research is focused on the use of different media to teach and communicate mathematics to diverse audiences. In this connection, he is a co-founder and President of an educational technology company, BrainQuake, that creates mathematics learning video games. He also works on the design of information/reasoning systems for intelligence analysis. Other research interests include: theory of information, models of reasoning, applications of mathematical techniques in the study of communication, and mathematical cognition. He has written 32 books and over 80 published research articles. Recipient of the Pythagoras Prize, the Peano Prize, the Carl Sagan Award, and the Joint Policy Board for Mathematics Communications Award. In 2003, he was recognized by the California State Assembly for his “innovative work and longtime service in the field of mathematics and its relation to logic and linguistics.” He is an advisor on issues of mathematics learning and assessment using video games for GlassLab and ETS. He is “the Math Guy” on National Public Radio

De status van deze ONZIN:

De gouden ratio wordt inmiddels onderwezen aan allerlei beeldende kunst opleidingen en cursussen inclusief webdesign. M.a.w. er zijn welzeker nu allerlei werken die die ratio gebruiken maar louter omdat de makers in hun hoofd hebben dat het een regel moet zijn.

- Zowat alle grote webdesign sites hebben er artikelen over in totaal iets van 350.000

- Zowat alle grote fotosites hebben er artikelen over…

- Het wordt gebruikt in fonts, apparaat design in drukwerk en reclame…..

References
  • http://cogsci.stackexchange.com/questions/1627/is-golden-ratios-association-with-perceived-beauty-a-myth
  • Boselie F, 1992. “The golden section has no special aesthetic attractivity!” Empirical Studies of the Arts 10 1-18.
  • Boselie F, 1997 “The golden section and the shape of objects” Empirical Studies of the Arts 15 131-141.
  • Davis S T, Jahnke J C, 1991 “Unity and the golden section: Rules for aesthetic choice?” American Journal of Psychology 104 257 ^ 277
  • Green C D, 1995 “All that glitters: a review of psychological research on the aesthetics of the golden section” Perception 24 937-968
  • Hoge H, 1995 “Fechner’s experimental aesthetics and the golden section hypothesis today” Empirical Studies of the Arts 13 131-148.
  • Hoge H, 1997 “Why a special issue on the golden section hypothesis? An introduction” Empirical Studies of the Arts 15 111-114
  • Russell, P.A. (2000). Testing the aesthetic significance of the golden-section rectangle. PERCEPTION-LONDON-, 29, 1413-1422.
  • McManus, IC (1980). The aesthetics of simple figures. British Journal of Psychology, 71, 505-524.PDF
  • http://iaaa.nl/rs/compest.html

 

Where to even Start debunking this?

Goedkope lenzen online bestellen

April 13, 2014

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Grofweg haal ik via de websites deze volgende prijzen, waarbij Q-Lens het goedkoopste uit de bus komt:

yourlenses.nl: € 40,00 (€ 0 verzendkosten) lensway.nl: € 41,80 lensbestel.nl:
€ 41,80
lensexpress.nl: € 42,50
lenson.nl:
€ 43,90
getlenses.nl: € 43,98 toplenzen.nl : € 44,50 eyelens.nl:
€ 44,90
lowlens.nl: € 45,96 contactlenslonline.nl: € 47,00 lensbase.nl:
€ 48,30
123lens.nl:
€ 51,98
q-lens.com € 35,00 (€ 3,95 verzendkosten)

Het scheelt dus allemaal niet zo heel veel.

Echter om er een sport van te maken…. : bij lensbestel.nl krijg ik 10% korting als ik 8 stuks ineens bestel, dat brengt de prijs van 1 doosje naar € 18,81 (2 ogen = € 37,62). Dat is dan € 1,33 goedkoper….. dan Q-Lens… (omdat Q-Lens € 3,95 verzendkosten berekend).

En dus besteld… :

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Programma NSJ2014

April 13, 2014

via http://www.northseajazz.com/nl/programma/:

Vrijdag 11 juli: Pharrell Williams, Robin Thicke, Mavis Staples, Tedeschi Trucks Band, Gregory Porter, Mehliana featuring Brad Mehldau & Mark Guiliana, Tom Harrell “Colors of a Dream”, Paloma Faith, John Scofield Überjam, Joshua Redman Quartet with Metropole Orkest Strings conducted by Jules Buckley, Robert Glasper Experiment with Metropole Orkest conducted by Vince Mendoza, Booker T Jones

Zaterdag 12 juli: Stevie Wonder, Al Jarreau, Joss Stone, Quincy Jones Presents Nikki Yanofsky, Alfredo Rodriguez Trio & Andreas Varady*, Martial Solal Trio, Snarky Puppy & Friends, Children of the Light Trio: Danilo Perez, John Patitucci, Brian Blade, Ibrahim Maalouf, The Cat Empire, Sons of Kemet, Kenny Garrett Quartet, Dirty Loops, The Metropole Orkest Big Band plays Quincy Jones: “This is how I feel about jazz” conducted by Jules Buckley, Benjamin Clementine

Zondag 13 juli: Outkast, CHIC featuring Nile Rodgers, Daryl Hall & John Oates, Darcy James Argue’s Secret Society, Darkside, The Daptone Super Soul Revue featuring Sharon Jones & the Dap-Kings,  Charles Bradley and his Extraordinaires, Antibalas, The Sugarman 3 with special guests Saun and Starr and Master of Ceremonies Binky Griptite, Oscar D’Leon, PRISM featuring Dave Holland, Kevin Eubanks, Craig Taborn and Eric Harland, Buika, Electro Deluxe, Allen Stone, Neneh Cherry & RocketNumberNine

De Dragon Totem Girl Video…

April 11, 2014

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On the Internet travel hoaxes. Movies, pictures, stories: all kinds of stuff that are “incredible” or “need to know” etc… which have the purpose of becoming viral and being shared massively. Think of “bill gates will send you dollars e-mail” that is going around for 15 years now and people are STILL sending it around….

One of them is the video of  MonkeyWatching for the promotion of the video game “Dragon Girl”. In each video different powers of “Dragon Girl” are shown…

The most amazing thing however is the total absense of any critical thinking in so many people on these kind of hoaxes:

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etc…

imageSo… this is the Internet… every day a gazillion of these viral hoaxes are posted, mailed or send out. From the “new security camera’s” to “mysterious ancient pyramids found” and somehow… a certain group of people will just believe ALL OF THIS STUFF and especially if it says “SHARE THIS TO EVERYONE missing plane found video” etc…

That is what i don’t understand. In fact this total ignorance sometimes makes me pretty frustrated: you got a brain but don’t you use it…

WHY are these people not capable of any critical thinking? It seems utterly logical that in this case… a person with superpowers who moves someone “at superspeed” is not possible…. so ofcourse it must a commercial. BUT … somehow somewhere something in the brain of these people does not work that way. At least that is my theory. But I really don’t understand actually how people think that just take this in their brains and somehow it comes out as “yah, could be true…”. I don’t get it. Sure “Bill Gates will send you 10 dollar if you send this e-mail to EVERYONE”. Why this total absense of any skeptical thoughts here in a certain amount of people?

This parallel can directly be drawn larger to people who really believe in homeopathy, strange human powers, all kinds of magic, and pretty much most religions. “Yes, I put 1 drop of a plant in a stadium full of water, take out one bottle, pay 10 bucks for it and it works against my headaches…”. Why this total lack of any brain capabilities?

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Actually these hoaxes form a perfect example of how beliefs and religions are formed and how easily people communicate false messages that in time cover a whole lot of people believing absolutely nonsense without any critical thinking any more. Now what if the creator of this video just put it out without any reference? Then all of these bunches of people would be convinced that it was true until eternity………….. isn’t that weird?

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Luckily however we now have the Internet…. on the one hand these hoaxes and related false beliefs are trying to propagate again over the social networks we have… but on the other hand it becomes now more and more transparant where these false beliefs come from because of the amount of information so information is flowing back with information directly from the sources. There are sites with long lists of these hoaxes, people with a more skeptical mind having blogs, forums, wiki’s and people who then go out and use the same channels to communite that it is “false”.

So here is my giveback on a long threaded hoax:

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Let’s take the whole “God” thing people tend to believe in (above). To me it is more than obvious that this is amazingly false. Even when you think about it it becomes a ridiculous thought. However it has become a hoax spread to a gazillion people. If you think that the superpowers of the dragon video game girl is like “unbelievable that people actually believe this….”, it is even sadder.

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Where does it come from? This “God” is based on the “God” the jews e.g. the central figure “Jesus” believed in. They call him Jahweh. That Jahweh was one of a whole pantheon of Gods. Around that time it was still a Pantheon e.g. the God “El” was the sort of president of that Pantheon. the God Christians believe in was the “War God” from some ancient city. They believe in a book called the bible which is “the book of papyrus”. It is papyrus because an ancient city imported papyrus from Egypt and it was their main economics. So the Egyptian influence is huge. The Egyptians settled next to the Nile bringing them out of the stone ages about 4000 BCE. They then still ate people, they were still cannibals like many tribes in jungles today. Why are people cannibals? Because they believe if they ‘eat their flesh and drink their blood’ that they get superpowers. One of the superpowers is immortality. However with the rise of one of the Egyptian Gods (who had to be killed each day) Egyptians started to stop eating their own (but still ate their enemies) this whole ritual around it is what is still done in each church today everywhere. That is because that stone age notion of “sacrifice” somehow managed to stay alive through these hoaxes. They have feeling that they need to “sacrifice” to get a special superpower “immortality”. If that is not a major hoax… I don’t know what is. For the God thing: if you track that specific War God of that specific City in that whole pantheon of may Gods even further back in time you end up with a massive amount of representations of natural occurances and animals. Etc… Etc..  a gazillion amount of resources out there to read further.

Enough reading material out there to investigate and learn for yourselves: the good thing about the Internet.

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But the thing of course is that it is not only about 1 hoax because if it is about 1 specific hoax “the dragon girl video”, the problem is not solved. I think we must fundamentally become more critical to past and future hoaxes.

Why is it a problem that people believe that the “dragon girl video” is real? Or why is it a problem if people believe that Santa Claus is real? I don’t have an exact answer to this. But I think it is part of human nature to try to be truthful and help other humans grow and learn and identify false things. I think that is why people make a “lists of hoax” so they are helping people finding information. That is probably also why people set up blogs: to help other people. It is also why there are data analysts in companies: to help the company make a next step based on forecasts of actual data and not false beliefs. These are the companies that survive and the nicest places to work at.

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All in all these hoaxes achieve one good thing: they make people more skeptical. At least the majority of people, and that is a good first step. The more hoaxes, the more people will learn to grow skeptical and when people start to become skeptical they start asking questions. which is good because the answers are there.

p.s. guideline:

- anything that is not possible according the laws of nature is a hoax.

- anything that needs to be spread or evangalized `send/spread this to EVERYONE´ is a hoax

- always check sources and make sure sources are trustworthy, anything from sites that earn money by posting viral stuff is probably a hoax, anything on youtube that has millions of hits and an ad running beneath: hoax

- keywords like “amazing” , “science does not know” , “scientists amazed” , “ancient”, “mysterious” : hoax

- the top N sites in Google when you search on stuff : many times hoax sites (millions of people rather look at the “mysterious ufo found” than “a rational explanation of NASA for occurance X”) (so these sites end up at the top of the Google listing).

- Wikipedia : use it to form an opinion but always check the original sources especally when it is about anything that can bring in money or power for one person or a group of people.

And one last idea: Facebook and Google could help by at least putting a banner above these hoaxes like “this is from the videogame dragon girl and not real” or “this is from the book bible and not real” or “spiderman does not really exist” etc… would also help people getting the right information in their brain.

NSA wist al 2 jaar van de heartbleed bug

April 11, 2014

Zie: http://www.bloomberg.com/news/2014-04-11/nsa-said-to-have-used-heartbleed-bug-exposing-consumers.html

“and regularly used it to gather critical intelligence, ”

Logical:

One the one hand governance agencies and maffia cyber teams with a gazillion amount of resources  finding vulnaribilities … and on the other hand open-source devotees who in their spare time once in a while add some code.

It would not amaze me if there exists a hidden vulnaribility-marketplace where unknown vulnaribilities are sold for huge amounts of money.

“Currently, the NSA has a trove of thousands of such vulnerabilities that can be used to breach some of the world’s most sensitive computers, according to a person briefed on the matter. Intelligence chiefs have said the country’s ability to spot terrorist threats and understand the intent of hostile leaders would be vastly diminished if their use were prohibited.”

Link

I was actually looking for a shop to order an Electric Imp but then I found Flora… and then I found this nice project.

This Plush Game Controller from Flora is really nice. Adafruit has each wednesday a nice new webshow of new wearable projects.

I’m actually thinking what wearables I could create with this stuff. (ok… I’m thinking of some wearables on which I could integrate some GPS stuff and a connection to track my kids :) (like this stuff). Actually now that I think of it… If I put some red leds around it which start blinking when they go “out of predefined range”… would make it work even without connection… hmm…

Becky Stern shows you how to make a GPS-enabled coat: http://learn.adafruit.com/flora-gps-jacket/