‘How do children see the world?’ is a question of immense importance which fascinates not only psychologists but also parents and all those concerned with education. In this English translation, first published in 1976, the author, who was Professor of Psychology at the René Descartes University in Paris, provided the most comprehensive review at the time of the development of visual perception in children, a field to which she herself had made a substantial contribution. Her book, which gave the first comprehensive study of the relationship between cognitive development and perceptual activities in small children, explores how they interpret visual information and gradually build up a picture of the world. The author had devoted fifteen years to research on the visual world of the child and possessed an exhaustive knowledge of the experimental literature on the subject in English, French, Russian and other languages. She saw perception as a form of knowledge which the child exploits and adapts in a variety of ways at different stages of development. This is brilliantly demonstrated in her own research on the strategies children use in judging things as ‘different’ or ‘the same’ and the way these relate to the structure of their perceptual organisation. This book is essential reading for anyone with a serious interest in developmental and cognitive psychology; it also provides an object lesson in the application of experimental methods. In addition the organisation of the material made it a valuable textbook for advanced undergraduate and post-graduate teaching and will still be of interest in its historical context today.