 His design of rectangular stamps remained in use until 1902.Many of his sketches and paintings show a whimsical sense of humour, though his sensitive portrayals of the mixed population of Cape Town and of the tribes he encountered on the Smith expedition to the north, have become an invaluable record of life in 19th-century South Africa.The return of many of his paintings from England to South Africa in 1978, gave art historians a fresh appreciation of his work and greater insight into that period of Cape history.