The document discusses the epistemic cultures of hackers, snowboarders, and jazz performers through an analysis of their improvisational practices. It examines how they engage in place making through flow experiences mediated by their use of technology and instruments. Their epistemic practices are characterized by mentor learning, clear frames of reference, physical closeness when practicing, and a playful seriousness about their craft. Comparing these groups provides perspective on how hackers operate through improvisation within established rules and frameworks.