The Attraction of Opposites
One of the best known accounts of the psychology of perception is Richard Gregory’s book Eye and Brain (Gregory 1998). It is relevant to this chapter because it uses an example from archaeology to illustrate the way in which the mind creates visual patterns. The author considers the methods by which excavators distinguish between the remains of rectangular and circular buildings. He considers the Middle Bronze Age settlement of Thorny Down in southern England, where different scholars have inferred the existence of different types of buildings on the basis of the same field evidence. The original excavator was uncertain of the precise form of the settlement (Stone 1941), but, in later years, Piggott identified the site of a large rectangular house there (1965: Figure 87) and Musson recognized circular structures (1970: 267; Figure 57). Gregory’s summary of their method is as follows:… Science and perception work by knowledge and rules, and by analogy . . . [In the case of Thorny Down] some of the holes in the ground might be ancient post holes; others might be rabbit holes, to be ignored. One group of archaeologists accepted close-together large holes as evidence of a grand entrance. They were altogether rejected by other archaeologists. One group constructed a large rectangular hut; the other, a small rectangular hut, and a circular building. ‘Bottomup’ rules—holes being close together and forming straight lines or smooth curves, and ‘top-down’ knowledge or assumptions of which kinds of buildings were likely—affected the ‘perceptions’. Both could have been wrong (1998: 11–12)…. The identification of a rectangular building at Thorny Down took place at a time when it was believed that the Netherlands had been settled from England during the Bronze Age. The argument was based on pottery styles and the distribution of metalwork (Theunissen 2009). Most likely there were contacts in both directions. As the Low Countries were characterized by a tradition of rectilinear architecture, what could be more natural than the construction of a longhouse at a site on the Wessex chalk? Dutch prehistorians attempted to find similar links between domestic architecture on both sides of the North Sea and soon they identified roundhouses of British type in their excavations.