A polar projection of a dotted line rotating in depth incorporates 3 distinct cues to direction of rotation: (a) the direction (D) in which the motion of dots on opposite ends of the line are periodically congruent, (b) the order (O) in which the dots reach their respective limits of angular displacement in the visual field, and (c) the differential retinal velocity (V) of dots on the near vs. the far side of the axis of rotation. 24 undergraduate Os repeatedly viewed each of 3 polar projections of a dotted line rotating in depth; 1 incorporating only cue V, another, cues D and V, and a 3rd, cues O and V. Os' identification of rotation direction using cue V alone was better than chance, and improved significantly with the addition of either of the other cues. Performance improved with practice using the 2-cue projections but declined using the V projection. (PsycINFO Database Record (c) 2006 APA, all rights reserved)