A simple but mind-boggling optical illusion of the impossible object type. This illusion shows two independently moving nuts that seem to defy the laws of geometry.

Read more:

• Wikipedia: Optical illusion, Impossible object

Original description:
brusspup t-shirts! http://brusspup.spreadshirt.com/ This is one of my favorite illusions. Took me forever to make this. But was pretty happy with the results.