The four squares appear to float on top of the wavy pink background.  As you watch this image, the background seems to flutter slightly to both the left and the right.This illusion was designed by French artist Daniel PICON.

Other Optical Illusions You Might Enjoy

Fall Floating by Rob Gonsalves

18

Impossible Squares

18

Four (Illusion) by Tony Corkery

18

Floating Boxes Optical Illusion

18

Johan Lorbeer – The Floating Man

18

Magic Floating Cube

18