Sand Play Therapy is an expressive therapy that uses a tray of sand and miniature objects to allow children to symbolically act out and resolve inner conflicts and psychological issues. It was developed by Margaret Lowenfeld in the 1930s and emphasizes using a three-dimensional sand "world" to explore a child's deeper psyche and integrate their psychological condition. The method involves the child constructing a sand picture with miniatures provided while the counselor observes without interference to understand the child's issues and perspective. Common stages of sand play include chaos, struggle, and resolution as psychological problems are worked through.