Both the top and bottom half of the image have the same number of dots, but the ones on top appear to disappear unless you’re looking at them. This is an example of a Hermann grid illusion, an optical illusion first documented by Ludimar Hermann in 1870. According to SharpBrains,

Because toes aren’t weird enough looking already, nail artist Tahvya of Nailedbytav created this realistic eyeball toenail art. She handpainted each eyeball, and says the whole process took about three hours. Three hours well spent if you ask me! This probably goes without saying, but this is the perfect pedicure

This is a shot from what I assume is a Bed Bath & Beyond or similar store featuring a rack of coffee mugs that are trying to destroy my brain.  I’ve gone shopping for coffee mugs on numerous occasions and never experienced this sort of painful illusion before.  Why is