3D Terrain
When I run games, I try to limit the potential for players to diverge in their understanding of the 3D space in their imagined versions o events. I like everyone to be on the same page, and to share a collective understanding of how things are unfolding, especially when a game starts getting tactical. A lot of this probably comes from playing with miniatures where the tactical play is literally laid out with physical pieces of terrain and small figurines that depict the characters. Don't get me wrong, a also like a good game where theatre of the mind has been executed well...but I've see so many arguments at tables of the years where one person has a distinct impression of how things are unfolding while another person is viewing things in a very different light. In such a case, both might be valid interpretations, but are often irreconcilable. The slowing down, and sometimes complete disruption, of the game is undesirable. It's probably one of the reasons I like a good LARP...