The moon illusion is considered a size illusion because the moon is a huge object but we see it as an object about the size of a fingernail.

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Quizplus · Accepted Answer

The moon illusion is actually a perceptual illusion of distance rather than size. While it is true that the moon appears smaller than it actually is, this is not the result of a size illusion, but rather a result of the way our visual system processes information about distance and size.

The Moon Illusion Is Considered a Size Illusion Because the Moon