"Yea, uhh... I'd like a pool that turns into a floor"

Apparently they can do that.  As exhibited below.  I'd not tell anyone about this, then when my friends come to visit I'd let them choose between an air-mattress and a normal mattress that are set up right next to each other, and then wake them up at 5am.

Video available at the links.  

Hydrofloor via Notcot via Gizmodo