The phi phenomenon provides a particularly elegant demonstration of the idea that

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The phi phenomenon is an optical illusion that illustrates the Gestalt principle of perceptual organization, specifically showing that our perception of motion (the whole) is different from the individual visual stimuli (the parts) that make up that perception. This demonstrates the idea that the whole is different from the sum of its parts.

The Phi Phenomenon Provides a Particularly Elegant Demonstration of the Idea