First published in 1997. Volume 6 in the series titled Jean Piaget: Selected Works. The authors of this title, having studied all aspects of the development of intellectual operations, and having attempted to analyse some of the characteristics of perceptual development, felt it was necessary to tackle the question of the evolution of mental images. These ten chapters provide digestible commentary and discussion on the classification, reproduction, and transformation of mental images - with focus on kinetic images, anticipatory images and the spatial image.