ABSTRACT
James J. Gibson suggested that physical motions, the motions of material objects, should be distinguished sharply from the corresponding optical motions that make them perceptible to an O. The adjacent units of optical texture on one side of a possible division in the optic array are preserved while adjacent units of optical texture on the other side of the division are progressively added to the array or are progressively subtracted from the array. A motion picture display can be made beginning with a textured rectangle on a differently textured background, progressing to a mixture of the texture of the background with that of the rectangle, and ending with the texture of the background only. A motion picture sequence has been made beginning with a white disk on a black ground, with curved segments of the disk being successively deleted from the periphery inward.
