"The client is given the possibility, by means of figures and by arrangement of the sand within the area bounded by the sandtray, to set up a world corresponding to his or her inner state. In this manner, through free, creative play, unconscious processes are made visible in a three-dimensional form and in a pictorial world that is comparable to the dream experience. Through a series of images that take shape in this way, the process of individuation, as described by C.G. Jung, is stimulated and brought to fruition."
From: Introduction to Sandplay Therapy, Dora M. Kalff, 1986