V4, where the light reflected from a surface is compared with that reflected from surrounding surfaces, in order to control for relative rather than absolute brightness.

ECONOMIST: The biology of art | The

This handheld device measures the different wavelengths or types of light reflected from a surface.

NPR: Using Science to Rescue Art

Group narcissism takes over, as Generation-i falls in love with its own image reflected on the surface of the cybersphere.

WSJ: David Gelernter: The Pros and Cons of Cyber-English