| Linear Perspective | Two converging lines appear to be parallel and receding in depth (Wickens, 1992). |
| Interposition | This is when one object obscures another, the object that is partially obstructed appears more distant (Wickens, 1992.) |
| Height in the Plane | During normal viewing objects that are higher in our visual field are assumed to be further away (Wickens, 1992). |
| Light and Shadow | An objects' shadow when lighted provides some clues about the objects' orientation relative to us and its three-dimensional shape (Wickens, 1992). |
| Relative Size | If through experience we know that two objects are the same true size, the object subtending a smaller image on the retina appears to be further away (Wickens, 1992.) |
| Textural Gradients | Textures grow finer at a greater distance (Wickens, 1992). |
| Proximity-luminance covariance | This cue is closely related to textural gradients in that the closer an object is the brighter it appears. Therefore a reduction in illumination and intensity are assumed to be further away (Wickens, 1992). |
| Aerial Perspective | The more distant an object is the "hazier" and less clearly defined it is (Wickens, 1992). |
| Relative motion parallax | When we move relative to a three-dimensional picture the objects that are closer appear to have greater relative motion to those that are further away (Wickens, 1992). |
Last updated: Nov28,1995: Dave Crow