Cool Optical Illusion

November 15, 2004 | General, Toys and Gadgets | By: Mark VandeWettering

A classic illusion is the hollow face illusion, where a concave casting of the face appears convex. This is demonstrated neatly here, with a simple cardboard cutout whose head appears to track you as you move around. Very neat. There are lots of other cool illusions on the parent website, check them out too.