Spinning Sihouette Optical Illusion

If you look at the spinning girl's silhouette, you will think it is spinning clockwise, probably. When you check her shadow below, momentarily the spinning direction changes in your mind, and now the girl is spinning counter-clockwise. It can be quite hard at the beginning to notice switch of the spinning direction, but eventually you'll manage.
Spinning Sihouette Optical Illusion - Mighty Optical Illusions