The Ponzo illusion illustrates that in some illusions:

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The Ponzo illusion is a visual illusion where two identical lines appear to be different lengths due to the context they are presented in. The lines are placed between converging diagonal lines, which create the impression of depth and distance. This illusion shows that distance cues can distort size cues, leading us to perceive the top line as longer even though it is the same length as the bottom line. Monocular cues, previous experience with corners of rooms, and eye convergence are not the focus of this particular illusion.

The Ponzo Illusion Illustrates That in Some Illusions