deceiving depth 
madlyn kates 

Projection with a specific intensity distribution is used to dissociate surface geometry from light information that is incident on the retina. While the physical surface of the projected image is a concave hemisphere, the luminance cues suggest otherwise. As the gradient rotates, depth cues perceived as shadows and highlights seem to alternate between exaggerating the physical shape, making it appear more concave, and opposing it altogether, making the surface appear to pop forward.