The Bumdrum is  a very sensitive custom MIDI controller made by Buggy Boy for Red Bull Music Academy 2010 London:

The design of the instrument is highly inspired by the Hang Drum and Aqua Drum, the difference being the number of places to make sound is modular as well as the timbre of the sounds produced is infinite. Not only one can control virtual instruments with the Bumdrum, but also can manipulate samples, effects, arrangements and so forth.

More info on the Bumdrum at Buggy Boy’s site.