In the Northeast, a pool can be used more if it is indoors. Rasmussen / Su Architects of Philadelphia cleverly designed a pool for the inside of a home. It sits on a reinforced slab, which is set on reinforced piers drilled down to the level of a nearby basement. Structurally, the floor and walls of the space are independent of the pool and lap over its edges. A retractable cover is located at the pool’s far end.