he shadow monocular depth cue has several rules: If an object is solid, it will cast a shadow. If there is only one light source, then all shadows will fall in the same direction and the shadow will be opposite from the source of light. Objects with shadows falling on them are farther away than objects casting the shadow. If the object is lower than the “ground plane” (like a well), the shadow will appear on the same side as the source of light.
Occlusion, also referred to as overlapping or interposition, occurs when one object blocks another object. The object that is blocked is understood, by this cue, to be farther away than the object blocking it.
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