Re: Overhead projector for a battlemat.
First thoughts: with the 'backgound' being projected are pre-arranged, there is the opportunity to do 'transformations' such as 'you are abruptly teleported to...' situations, simply by changing the backdrop.
The need to be pre-prepared means that this can't happen just anywhere, but the classic 'teleport from one room to another in a dungeon', fixed point to fixed point can be done.
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