  Following Thomas Schelling (1960), who introduced the notion of a focal point, Lewis argues that agents will select the salient convention. A convention is salient (it is a focal point) if it “stands out” from the other choices. A candidate convention might acquire salience through precedent, explicit agreement, or its own intrinsic properties. Schelling conducted a famous experiment to illustrate the concept of salience. He asked subjects to choose a time and place to meet a friend on a given day in New York City, without any possibility of prior communication about where or when to meet. Most respondents chose noon at Grand Central Station. Somehow, then, this choice stands out as the most conspicuous. As Schelling’s example illustrates, salience is a “subjective” psychological trait that does not follow in any obvious way from the rational structure of the strategic situation. Hume already anticipated a role for subjective psychological traits, noting that our choice of convention often depends upon “the imagination, or the more frivolous properties of our thought and conception” (Treatise, p. 504, note 1).