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, “the illusion results from retinal cells adjusting the brightness of an image by adjusting the intensity of the light signal in many small sections, which allows you to see a wide range of both bright and dark details in the same image.” I don’t like it. I don’t like my eyes playing tricks on me. Or my friends playing tricks on me, so if you’re hiding around the corner ready to smack me in the face with a plate of shaving cream, you can forget about ever celebrating our one year friendiversary.

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