{"version":"1.0","provider_name":"Rainbow Dash Network","provider_url":"http:\/\/rainbowdash.net\/","type":"link","title":"Narwhal (narwhal)'s status on Saturday, 28-Feb-15 02:52:49 UTC","author_name":"Narwhal (narwhal)","author_url":"http:\/\/rainbowdash.net\/narwhal","url":"http:\/\/rainbowdash.net\/notice\/3863578","html":"This is a popular example of the phenomenon, you've probably seen it before. Tile A and Tile B are both actually the same colour, but because out brain assumes shadows make things darker we assume that Tile B is lighter than it actually is. <a href=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/6\/60\/Grey_square_optical_illusion.PNG\" title=\"http:\/\/upload.wikimedia.org\/wikipedia\/commons\/6\/60\/Grey_square_optical_illusion.PNG\" class=\"attachment\" id=\"attachment-819198\" rel=\"nofollow external\">http:\/\/upload.wikimedia.org\/wikipedia\/commons\/6\/60\/Grey_square_optical_illusion.PNG<\/a>"}