Transpersonal Sandplay Therapy Center Sandplay, Sand Tray Therapy, The World Technique are all names given to a non-verbal therapeutic tool developed by Dr. Margaret Lowenfeld in London, England in the 1920s. Today the term Sandplay is most widely used to denote this method of the use of sand and water in a tray in which toys or miniatures are placed. The scene or world gives both the maker ...