杏吧原创

This spiral animation makes you think dots are moving in the opposite direction to reality. Initially the dots move in an anticlockwise spiral towards the centre of the screen. But as they get closer to each other, they appear to move in the opposite direction.

The illusion was created by Peter Meilstrup and of the University of Washington in Seattle. It fools us because each dot contains a grating that moves in the opposite direction to the true direction of the dots. When viewed individually, it鈥檚 easy to see the real direction of each dot 鈥� it鈥檚 only when they get close together that the grating takes effect and alters the perceived direction of motion.

See more: Don鈥檛 believe your eyes: This year鈥檚 best illusions