Theming is one area of the game that I pretty much completely ignore right now. I click "Swap and Optimize" perodically, and that's about it. But I thought it was time to understand this area a bit better. So I could use some tips on ways to optimize theming. I know off the bat, at minimum 2 Literatures will theme the amphitheater, which I believe gives +4 tourism and +4 culture....plus another +2 culture (also if someone could explain the UI I'd appreciate it, I've never really understood what the active theming bonus means vs the numbers off to the side of the works).