Comments: 34
demontroll [2012-11-30 10:47:29 +0000 UTC]
I think the effect has to do with how large your pupils are in your eyes. When you no longer look at the dark spot, and instead look at a brighter part of the screen, your pupils shrink. This makes the intermediate darkness area darker and makes the area of the dark spot larger. The growing and shrinking of the dot has to do with adjustments of your pupil size.
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MisterCobalt [2011-08-11 05:24:30 +0000 UTC]
It doesnt shrink back down when you focus again either O.o
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AP3RTUR3 [2010-10-10 08:23:49 +0000 UTC]
great illusion
from a mathematical standpoint circles actually have ∞ corners, so the only problem would be focusing one
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DEakaBlackDragon In reply to AP3RTUR3 [2010-10-14 05:29:45 +0000 UTC]
really. yeah but, eyes have the greatest focus in the world.
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AP3RTUR3 In reply to DEakaBlackDragon [2010-10-14 20:13:50 +0000 UTC]
yeah, just take a hexagon. it's much more similar to a circle than a tetragon. If you choose smaller and smaller side lengths sometime you'll have a good approximation to a circle.
A theoretical circle as infinite corners. But in praxis the number is finite. For example your image has 650x526px.
So the diameter of the biggest possible circle would be 526.
u=πd=π*526≈1652.
So the biggest possible circle has 1652 corners.
But after all it's just a matter of definition of which reference frame you use. Every pixel has again three components (rgb) and each liquid crystal panel consists of atoms. If you would have a scanning electron microscope you could see them.
Anyways, this topic allows hours-long philosophizing.
P.S. Do you have an explanation why our brains think that the circle is growing?
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DEakaBlackDragon In reply to AP3RTUR3 [2010-10-16 21:11:18 +0000 UTC]
Yeah. But, I remember reading on why it looks like it's growing it has something to do with how our brains process color (I read it on another optical illusion)
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Katilis401 [2009-06-05 18:55:02 +0000 UTC]
I stared at the black circle and I saw floating objects on the white and faded. Weird...
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DEakaBlackDragon In reply to Katilis401 [2009-06-05 20:08:43 +0000 UTC]
U'r suppose to stare @ the area where the squares & the blackness of the edges of the circle meet!
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Katilis401 In reply to DEakaBlackDragon [2009-06-05 20:10:29 +0000 UTC]
I know. I was trying the circle out first though. Heh. It does actually works and it's real entertaining (in my case).
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HeroFanatic [2008-12-19 00:20:02 +0000 UTC]
that's cool. it works :]
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xdarkzero [2008-11-06 21:59:43 +0000 UTC]
intresting.
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Pinday [2008-11-06 07:33:01 +0000 UTC]
it works!
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