向转左向转右, clockwise, anti-clockwise

你看看图画里面的人型到底正在转左还是右?
其实答案是两边都是, 这是OPTIC ILLUTION, 试试用你的眼睛改变她的方向.
只要你稍微把焦点放在下面的影子, 你就可以容易控制她要转的方向.

Look the shadow inside, you think she is truning clockwise or anti-clockwise?
Actually the answer is both. The is Optic Illution, it depand on how you see.
When you focus on the shadow below, you can easy change the truning direction.