Quote:
Originally Posted by spadebidder
This is correct, the boxes are totally different size and shape. If you measure the 2D image it might measure the same, but that's like saying if you measure your thumb and then measure the wall across the room that spans your thumb's width when you hold it at arm's length and look across it, they are the same width. This is a dumb "illusion" if you can even call it that. Everything you see in an image or in real life is a 2D image hitting our eye, our mind fills in the depth even IRL based on angles and parallax from 2 eyes. Stupid argument about this one.
If this isnt a stupid response (which it is) then the illusion in the OP isnt a real illusion either, since in the real world we fill in shading and coloration based on shadows and adjacent brightness, so even if you show that the two squares are the same color in some artificial 2D world, they arent REALLY the same color at all, they are whatever our eyes say they are.
But instead it actually is a PROTOTYPICAL illusion and a really neat one and you dont know what an illusion is.