the British child psychiatrist Margaret Lowenfeld (1935), 1939) developed a play technique for child psychotherapy, called ‘World Technique’, which was based on H. G. Wells’ (1911) early publication ‘Floor Games’. She was the first to use a tray of sand and selected play figures
This passage establishes the World Technique’s historical origin, identifying Lowenfeld as the inventor and Wells as the inspirational precursor, and specifying the sand tray with miniatures as its distinctive innovation.
, Sandplay therapy: An overview of theory, applications and evidence base, 2019thesis