In his foundational work, John Searle explores the question of what it means for the social to exist. What distinguishes social facts, such as money, from natural facts, like the height of a mountain? Searle concludes that social facts are constituted by phenomena of collective intentionality. To illustrate this, he develops the now-standard philosophical formula "X counts as Y in C," which breaks down how, for example, a piece of paper is treated as money in a specific social context. A brilliant analysis, a classic.