 Turbayne’s thought about metaphor was a collection of undeveloped gestures. It took Kendall Walton (1993) to rediscover these ideas and make an organized theory out of them. Walton has pioneered an approach to imaginative play in children and its analogues in adult human culture built around the notion of a game of make-believe. Such a game is governed by complex, tacit, mutually understood rules or norms, principles of generation, that render what’s fictional in the game, what players of it are supposed to imagine in playing it, a fixed function of the actual states and behaviors of various things and people they perceive, manipulate, and otherwise interact with as they play it. Walton calls such generators of fictional content props.