1. Interposition (overlap): An object that is partially covered by another object is farther away.
2. Familiar size: Previous knowledge of object sizes aid in judging distance.
3. Linear perspective: The farther away the object is the smaller it appears to be.
4. Atmospheric perspective: Objects farther off in the distance appear less saturated and less sharp (fuzzier) than those nearby.  The more atmospheric particles between the viewer and the distant object the more light that is scattered.
5. Motion parallax: Stationary objects that are physically closer to a moving viewer appear to shift faster than those farther away. Example: Driving by in a car looking at objects near and far.
6. Shading:  Uses light falling on an object from a certain angle to give form and depth to an object. Cast shadows aid in locating an object.
7. Patterns: Use contour lines to infer depth.  It is always assumed that the light comes from above; a totally different perception is obtained if the image is viewed upside down.
8. Accommodation: The change of shape performed by the eye lens to focus on an object aids the brain in determining the object’s distance.

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