What is "fun"? Wait, wait, don't go! Okay: we talk about "fun" as a feeling, maybe even different types of feelings. But have we ever talked about it as a process? This session looks at "fun" within the scope of emotional psychology, expanding Raph Koster's "theory of fun" by hybridizing it with Eckman's universal emotion theory and laying it on top of Vygotsky's developmental psychology foundational theory (zone of proximal development yo, that's flow, Csikszentmihalyi said). What this means is that FUN is shorthand for a very complex psychological process by which we as humans convert STRESS into SATISFACTION through INSIGHT. These are big psychological universals that, when understood more deeply, change the way you look at your own game designs. If you liked the names in this description, these are the nerds you're looking for.