This pool is awesome. Hidden pools. The ground moves up and down. Can be the cover for a patio. And have different depths: A wadding pool for children, and paddling pool/spa depth, and big pool/ cannon ball depth. Floor/cover moves in 2 minutes.
My husband made this splash pad in our back yard for our 4 kids. A great alternative to a swimming pool. It was also featured on Ohdeedoh.com http://www.apartmenttherapy.com/a-super-splash-pad-for-four-fl-148262