Abstract: An apparatus was designed in which two moving stimuli are presented on a twodimensional ground glass screen in the frontal plane. S views the stimuli binocularly, and by means of a polaroid system, he sees one stimulus with each eye. When the two stimuli move on the screen in a certain relationship to evoke the convergence and divergence movements of the eyes, S could observe kinetic depth effects describing various paths. The course of the stereoscopic depth movement could be prearranged or predicted by the transformations of the vergence angle of the eyes. The possibility of designing threedimensional visual displays by way of controlling the vergence movements of the eyes is discussed.

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