This episode of Playthink welcomes game designer, scholar, and professor Celia Pearce as we discuss the rich areas of play theory explored in her new book, Playframes: How do we know we are playing? Interviewed by MS candidate Reef (Harith Liew), Pearce leads us through a fascinating set of questions around the metacommunication of play. WIth topics ranging from theme parks, to sports, to cosplay and video games, Pearce creates distinctions for us, both designers and players, that help us understand how better communications around what is play and when we are playing can start to build better and safer playful spaces.