It is the Bogdon Box Bass – you can get one for real here on the Bogdon site. Choose between 2 or (the very dizzy heights of) 3 strings. They even have demo videos (lots of them). I’m almost ashamed to say that it doesn’t sound too bad at all! Who’d have thought?
They are priced at around $100 (no idea what that is after shipping to Europe or Asia). It is truely unique. I wonder if it is a cheap way to deal with my URB cravings?!?