Despite years of theorization, a concise definition of what constitutes a medium remains elusive. A practice-based case study in generative typesetting leads to an analytics of becoming that highlights the external dynamics of media. Rather than the referentially recursive McLuhan formalism of “studying media as media” (a position which leads to theories that are inapplicable to the dynamics of the computer metamedium), Gilbert Simondon’s theory of individuation provides a starting point for raising questions about the on-going processes that shape–and are shaped by–media. The practice-based case study leads to a conclusion that positions FLoSS (Free/Libre/open Source Software) as a potent site of agency that encodes radical potential for collective becoming.