Margaret Lowenfeld realized that play was the medium through which children worked out their emotional conflicts and that it was a cognitive process which could be analyzed, in a non-Freudian way, to understand and deal with behavior problems and also perhaps help children to develop. She developed the then new concept of non-verbal communication, and methods and tools for using play as therapy and as a therapeutic and analytical tool. This book follows on from her classic book "Play in Childhood," which was published in 1935.