A truly preposterous instrument. I’ve seen one in use once, but the context eludes me at the moment (Rawlins Cross, perhaps?)… Regardless, it’s played by tapping (and a myriad of other techniques too…). It never really caught on, but it still has a very devoted following. I’m pretty sure that’s Tony Levin in the pic… he worked with Peter Gabriel and King Crimson among others. Anyone up for a Chapman Stick YouTube rabbit hole?