Altman and Taylor use a wedge to explain this theory. In this example, the beginning of a relationship is represented by a narrow and shallow wedge because only a few topics are discussed. However, as the relationship goes on, the wedge should become broader and deeper, including more topics of personal significance. The wedge must drive through three "layers" in order for intimacy to develop. The first is superficial "small talk" with little personal information about the speakers. The next layer is intimate, with increasing breadth and depth and more personal details. The third is the very intimate level, where extremely private information is shared.