A sink, shower and toilet all pull out from the wallspace and other modules are then usable for storage, plumbing and electrical needs. All in all it isn't that far of a reach - pull-out sinks already exist so this simply extends an existing set of interior design ideas and integrates them into a unified bathroom design concept. Moreover, one could easily imagine this kind of approach working as a retrofit - you would simply need to create an additional wall at the expense of a foot or two of area - likely more than made up for by the space saved by ridding oneself of a traditional bathroom.
