Ainsley was looking out the window of her parents' car as they were taking a trip to the beach. To her eyes, it appeared as though the trees and fences nearest to the car went past her very quickly, but the large clouds overhead moved very slowly, a phenomenon known as

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Motion parallax is a depth cue that involves the apparent relative motion of stationary objects as observed by a moving observer. Objects closer to the observer appear to move faster than those further away, which explains Ainsley's observation.

Ainsley Was Looking Out the Window of Her Parents' Car