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Probably The Best Optical Illusion Ever

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Kratos:
http://giveupinternet.com/2009/05/15/probably-the-best-optical-illusion-ever-by-edward-h-adelson-pic/

So how is this possible?  I believe the shadow effect on Tile "B" causes our eyes to be shown as white.

idk just my opinion. Overall good illusion.

VC:
It's pretty easy when you remember that vision is based on contrast.

Fun trick: Hold your left palm flat in front of the area left of the A/B tiles.  Hold your right hand as a fist over the right half, like you are gonna give a thumbs-up.  Now, slowly extend your middle finger like you're going to sideways flip your screen off, so the finger covers the gap between the A and B tiles.

As that last bit of the light tile is covered and revealed, you will sense your perception of B darken and lighten.

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