+Revolutionised teaching. In 1960s, children sat copying text. In Piaget's activity-oriented classrooms children construct their own understanding, e.g. investigate physical properties of sand. At A level, discovery learning may be ‘flipped' lessons where students read up on content, forming their own basic mental representation of the topic prior to teaching. This shows how Piaget-inspired approaches may facilitate the development of individual mental representations of the world.