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Koffka's book is a very complete report about the achievements of Gestalt psychology. It not only reviews the literature of this field completely but discusses it and adds considerable new material.
The experimental work of Gestalt psychology deals extensively with the problem of perception. The general point of view appears in the following sentences: 'We have eliminated a whole network of hypothesis, the constancy hypothesis, the hypothesis of non-noticed but effective sensations, the interpretation and the assimilation hypothesis, and we have shown up the experience error.' 'It has become apparent that the