Oechslin discusses the idea of the primitive hut, and its role in the origins of architecture. He speaks about the primordial relationship of language to architecture. Oechslin claims that architecture progresses from necessity, to usefulness, and finally to aesthetics. He comments on the story in Vitruvius about the Greek philosopher Aristippus, who, lost, discovered geometic forms drawn in the sand and exclaimed that he was among civilized people. He discusses geometry in Vitruvius, geometry as a communication device.