Hollow Face Illusion

This amazing optical illusion creates the effect of making a concave mask of a face appear as a normal convex face,which means the concave mask will look just like a normal human face that actually appears to look at you and follow you in a very pronounced way as you move across it.The hollow face appears to be looking at the viewer when the viewer is standing directly ahead and looking at an extreme angle when the viewer is at a moderate angle.

This is the picture of Professor Richard Greggory of Bristol University who has done a lot of work on the Psychology of Vision.This is the actually the back side of the concave mask that is appearing to be an actual 3-D face.

Watch the video
below to see how it actually works.

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