Einstein Illusion


ein 5

Is the mask in the above image concave or convex? Strangely, it appears convex (sticking out towards you) even when viewed from the concave side. Even more strange: the face appears to turn and follow you as you view it from different angles.

ein 2

ein 4

Below is a profile view of the mask.

ein 3

Illusion works best when mask is illuminated from behind.