Experimenting with Adelson’s Checkerboard Illusion

Can you change how things seem? Phenomenological slideshow test below! Scroll past all the text if you must!

Edward H. Adelson‘s (1995) Checkerboard Illusion, or “Checkershadow Illusion“, remains one of the best lessons on how deceptive our perceptions can be, and it affords a great opportunity for phenomenological experimentation, which I promote with a slideshow below. Above is an inspired variation on Adelson’s original by a digital artist who goes by butisit¬†at DeviantArt.

If you have never seen Adelson’s original image before, look at it now (here below), and ask yourself, “Is the parallelogram region of this image labeled A darker than the parallelogram region labeled B?” If your answer is Yes, you are incorrect. If you insist, if you claim that region A is obviously darker than region B, you are still incorrect. If you think this means merely that A is not as much darker than B as it seems to be, then you are nevertheless incorrect.¬†Regions A and B are the same exact shade. Continue reading “Experimenting with Adelson’s Checkerboard Illusion”