THE RECTANGULAR FIGURES (RHOMBUS) HAVE SIDES THAT ARE STRAIGHT LINES.
OUR EYES HOWEVER ARE DECIEVED INTO SEEING THEM AS SLIGHTLY CURVED LINES.

NONE OF THE LINES ARE REALLY WAVY  ALL OF THEM ARE ABSOLUTELY STRAIGHT!

LOOK AT THE BIG BLACK DOT AT THE CENTRE WITOUT BLINKING.
THE BROWN HAZE AROUND IWILL SEEMS TO BE GROWING.