If children are allowed to do what they see done in the environment, they will perform a series of exercises which have no external purpose, but which are a preparation for the activity which is to follow. Children do these things, which appear to have no use, with great care and interest. There is a cycle of activity. These things may seem useless to us, but the child is preparing himself and preparing the coordination of his movements. One consequence of this is that he wants to climb.