 Wynn (1979, 1981) analysed Acheulian and Oldowan tools in terms of the insight into spatial relationships required to create each kind.On a more general level, Robinson's "Birth of Reason" (2005) suggests a large-scale model for the emergence of a Piagetian intelligence.Piaget's models of cognition have also been applied outside the human sphere, and some primatologists assess the development and abilities of primates in terms of Piaget's model.