Brenda is standing on the beach; the sea is choppy. She observes that the crests of distant waves appear not only smaller, but also closer together than do the crests of waves nearer the beach. This example illustrates a depth cue known as:

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Linear perspective is a depth cue that refers to the perception of depth and distance based on the convergence of parallel lines, as in the case of railroad tracks seemingly converging in the distance. In the case of the choppy sea observed by Brenda, linear perspective would explain why the crests of distant waves appear closer together, as they converge towards a common point on the horizon. Texture gradient refers to the change in texture or detail of an object as it recedes into the distance, interposition refers to the overlap of objects to create depth, and retinal disparity refers to the slight differences in the retinal images of an object seen by each eye, which allows for depth perception. None of these depth cues appear to be relevant to this particular example.

Brenda Is Standing on the Beach; the Sea Is Choppy