Don't believe half of what you see ...

A famous quote says "Don't believe half of what you see and none of what you hear." Do you see "spirals" in this image? They are not there at all, as illustrated by the image below! The small black and white squares are in perfectly round, evenly-spaced, concentric circles.

Thanks to http://www.realityprime.com/articles/another-illusion for this great optical illusion.

Ira Glickstein