The Alumitar was created by Paul Rubenstein. Imagine a guitar neck with no back, the curve of the fretboard going all the way around, now take away the frets and you have the Alumitar. It looks like it is made from an aluminium tube, it has 10 strings evenly spaced around the outside of the tube.
Paul says it can be played with a bow or plucked. It is fretless and it looks like it would be difficult to play, perhaps you would rely mostly on open tunings. I don't think it uses a conventional guitar pickup, maybe some sort of microphone or piezo transducer. The bridge is a ring around the tube, the strings are secured by their ball ends in holes drilled into the tube: simple and effective. The foot protruding from the bottom of the instrument suggests Paul plays it standing up, like a double bass.
Paul teaches kids how to build and play electric guitars and amplifiers in an after-school program. He is also a performing musician who has built an lots of unusual instruments and recording engineer. He experiments with microtonal scales, multiple strings and unusual tunings (a bit like guitar inventor Yuri Landman ).