The phenomenon of illusory motion described by Ames as the “rotating trapezoidal window,” the writers interpret as being given by the (monocular “pictorial”) depth cues inherent in the stimulus. In this paper three cues are separately examined: (i) aerial perspective, (ii) interposition, and (iii) gradient of texture density. The stimulus that is seen nearer is also seen moving in a nearer position than the other, and the real rotary motion is thus interpreted as an oscillatory motion or as a vertical motion in the frontal plane.
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