There’s nothing like subjecting your brain to mind-bending optical illusions that play tricks with what you see, and alter your perceptions.

When I was very young, I went to a museum which had numerous optical illusions on display, one of which required me to relax my vision in order to see a three dimensional object hidden within the print. These days, you don’t have to go to a museum or an exhibit of any sort to play tricks on your eyes. Thanks to the Internet—and to this very post—you can scramble your brains out in the very comfort of your seat.