When your psychology professor is lecturing to your class, she can tell which students are sitting in the first, second, third, etc., rows, in part because students in the closer rows obstruct her view of students in more distant rows. This illustrates the depth perception cue of:

This illustrates the depth perception cue of: interposition.

Explanation:

The vision of objects in three dimensions is called depth perception and allows us to calculate how far objects are. We talk about interposition when the objects that are further away can be totally or partially hidden from an observer by the presence of other objects interposed in the line of sight. When an object appears partially concealed, our visual system tends to perceive the covered object as further away and as closer to the imposed object. It is one of the most powerful depth indicators, although it only provides ordinal information about the distance of objects in relation to the observer.

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