Playframes builds on the work of Gregory Bateson and Erving Goffman to take a deep dive into Bateson's primary question: How do we know we're playing? In this book, Celia Pearce addresses this question by building a comprehensive theory of the specific mechanisms that metacommunicate the message "this is play." This "big tent" approach covers a broad swath of playframes, ranging from theme parks to cosplay, board and video games, and sports, and describes how spatial and temporal frames, as well as artifacts such as costumes and uniforms, toys, and sports equipment, let us know when a play activity is underway.

Pearce teases out distinctions between ritual and play activities, including social practices in which they merge or are indistinguishable, as well as incidents of frame breach or misalignment, where participants' perception of "what is going on" diverges. These principles are illustrated with a series of four topical studies that explore various scenarios in which play and non-play contexts are juxtaposed or blurred. These span from delightful (fan convention cosplay and simulated and virtual weddings) to confusing (virtual currency and bitcoin) to dangerous. Building on recent research, the book culminates with an in-depth analysis of the gaming roots of the January 6 Capitol insurrection and argues that playframe breach and deliberate misalignment were the major contributing factors.