In order to summarize the Gestalt psychologists' movement in a few words,one might say,

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The statement "The perceptual whole is different than the sum of its parts" encapsulates the main idea behind the Gestalt psychology movement. They believed that perception is not just the combination of individual sensory elements, but instead, the brain seeks to organize these elements into a meaningful and coherent whole.

In Order to Summarize the Gestalt Psychologists' Movement in a Few