Describes an experiment revealing a visual latency effect produced by the wearing of sunglasses. (SL)

Methods and optics of perceiving color in a black-and-white grating are described. A sample grating which produces the effect is included. (JN)

Describes subjective-contour illusions and gives explanations for perception of shape and brightness in these figures. Supports cognitive mechanisms rather than psychological mechanisms. Gives examples of subjective-contour illusions and summarizes explanations of other psychologists with regard to this topic. (CW)

A discussion of Edwin Land's experiments with color images from black-and-white photographs. Information is presented for duplication of these experiments by the amateur photographer. (BB)