a giant round ski that you have both your feet in and its raised up like a cone sort of. like this \____/
but all the way around like that so its basicly like a giant circle sled with a base and edges and bindings and you sit in it instead of standing in it.
the idea to me sounds pretty fun because you could go more than just two directions, technically you could 360 directions.
think about it, you could ride them straight, switch, snowboarders regular, snowboarders goofy, crooked, etc....
it seems like it could be really fun if it was made correctly