These lines appear to be angled up or down, but the horizontal lines are actually all parallel. Need proof? Try covering the top and bottom of one line of squares with a piece of paper. No slants to be found!
Your eyes will keep jumping to the spinning sunbursts of seeds – even though they’re all staying still.
Lose your focus a bit (seriously – try to go a little cross-eyed) and you’ll spot a secret message hiding in the black dots. Take a closer look, though, and the words will disappear from sight.
We bet you didn’t know that these famous paintings also had hidden messages.