Great hard illusion

I realized how great this illusion actually is. If you look at the spinning girl’s silhouette below, 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.Maybe if u closed your eyes for few seconds and opened them you will see the difference in direction...