Hey guys. My suggestion is walls for the dynamic lighting system that only block light/vision if you're standing on one side of them. So if a player token is standing on the left hand side of a wall, they can't see beyond into the right hand side, but if they're standing on the right hand side, they can see through to the left hand side. My main reason for wanting this is to make it easier/more realistic to set up cliff ledges, stairwells, rooms with multiple levels (i.e., an arena pit within a larger audience chamber) and things like that, though I imagine it could also be used to create some cool magical effects.
