Pretty, Schroeder, Brueggemann & Clark
Negative bust illusion and related method
 A negative bust illusion is formed of a surface (representing a negative of an object) that presents a concave side to viewers to generate an illusion that the object always gazes at viewers as they move within an enlarged field of view. The negative bust is analogous to a mold of the object, with its depth flattened to impart a wider effective range the illusion. The rigid shell has a cavity that defines the bust and is formed of a thin, translucent styrene material such that rear projection is readily imparted to the convex side for imparting animation to the gaze effect. 
The Walt Disney Company
G
G02B
inventional
William G. Marshall M.
Redmann Monroe