bathroom in a box

A competition design entry for the roca jump the gap contest is a cool-looking modular bathroom design. Each module is a "slice" containing elements such as a toilet, a shower or a basin. It includes storage for grey water that is used in the toilet. Interesting idea, though I really wonder about the usefulness of walls that essentially would be duplicating the walls in the house, unless this is meant to be freestanding within a larger room.