a duel circle underneath a grand ball of water with light reflecting through it held up by a ring held by 4 tall celestian pillars and stands like the tables and chairs in the stellarium instance and they used simmilar things to create shining light through things so water shouldn't be too difficult rotating or not it would look so cool the rest of the room would look purple blue and gold with the similar floors and ceilings of the stellarium instance.
That would be fun, an excellent idea for all the pvp'ers out there to do pvp in all of their favorite worlds, celestia being one. Nice idea, and i hope it will come true. :)