Floating dates back to the 1950s and this is something you might find . Some also call it a deprivation tank.
Float pods have been around for some time and are a little more modern looking and even the Chicago Cubs have one of these in their locker room
This is the newest thing on the market, float rooms take away the claustrophobic issue some had with the lid closing in on top of them. This is a room 8' X 4.5' and 7' tall with a glass see thru door.