Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jul 20, 2012
This amazing illusion is so strong that even when we are aware that we are looking at the concave, reverse side of the mask we cannot stop ourselves perceiving it as a convex, protruding face! For interactive versions of these illusion visit: http://www.echalk.co.uk/amusements/op...