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I still find this pretty amazing.

(squares A and B are the same colour).
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I love the GOG forums one. When you squint your eyes, you can see the threads doubled!
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*makes cute comment about the gold and white / blue and black dress before anyone else gets in with one - Like a German and his beach towel on the pool loungers*
Post edited April 15, 2015 by Fever_Discordia
BEER GOGGLES!!!
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ZFR: Post yours.

I still find this pretty amazing.

(squares A and B are the same colour).
You don´t know how long I spent once painting a drawing over an edge where two shades met. I didn´t get it why it wouldn´t match when I was just sampling exactly the same shade and putting it over the other side.

That was before..............studying about colour theory :P
anything by escher
My favorite one is based on the same principle as these shades.

http://www.anopticalillusion.com/wp-content/uploads/2014/01/Eye-Color-Optical-Illusion.jpg or http://www.themarysue.com/wp-content/uploads/2011/06/COoS-e1307246815784.jpg
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Fever_Discordia: *makes cute comment about the gold and white / blue and black dress before anyone else gets in with one - Like a German and his beach towel on the pool loungers*
I never did that :'D Took me a while to realize that both eyes have the same color oO
Post edited April 15, 2015 by jdsgn
In all seriousness though, this one is pretty mind blowing
(shows how it's done at the end)
https://www.youtube.com/watch?v=A4QcyW-qTUg
This is my favorite, as it is so simple and effective.

http://www.optics4kids.org/home/content/illusions/gradients/

This is the most infuriating, can't watch for too long as my eyes get too "busy".

http://www.optics4kids.org/home/content/illusions/hermann-grid-illusion/
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Fever_Discordia: In all seriousness though, this one is pretty mind blowing
(shows how it's done at the end)
https://www.youtube.com/watch?v=A4QcyW-qTUg
Wow. Pretty neat.
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ZFR: Post yours.

I still find this pretty amazing.

(squares A and B are the same colour).
I've opened this in Photoshop and it tells me they are the same colour, but I still refuse to believe it... :P
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Fever_Discordia: In all seriousness though, this one is pretty mind blowing
(shows how it's done at the end)
https://www.youtube.com/watch?v=A4QcyW-qTUg
That is very cool. Even once you see how it works and know what's going on you can't force your eyes to see what is actually there...
When I look in the mirror...
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Fever_Discordia: *makes cute comment about the gold and white / blue and black dress before anyone else gets in with one - Like a German and his beach towel on the pool loungers*
<span class="bold">For you.</span>
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snowkatt: anything by escher
This.
I like this one:
https://www.youtube.com/watch?v=VT9i99D_9gI