I'm picturing the Ba'ku people from Star Trek Insurrection, that about right in terms of technology and environment? They might not record history directly, but I imagine being a high art output race, the tumans would have lots of instances of historical events being captured as part of something else: I'm thinking of The Scream being linked with Krakatoa's eruption. They would probably love allegories and fables too, adding a romantic twist on the stories. It's interesting that they would mix and build cities together, it seems anathema to the tumans but I think there'd be some really fantastic blends of wood and canvas architecture possible with the bumans and lumans. Speaking of: If they live on separate homeworlds, how do they meet? Have you got something in mind for that? Manmade or natural? Don't feel the need to divulge, got to keep some secrets :)