It starts off as a totally respectable pool, and can turn in to a pretty nice patio. You can pick any size up to 18-feet in diameter and in a circular pattern. The Hidden Water Pool uses a pneumatic bottom that can go from patio to any depth pool you want (up to 6-feet deep). Got adults coming over "“ go with the full depth, got kids coming over "“ make the pool 2-feet deep. Pretty cool stuff. Video of the Hidden Water Pool after the break.