How portable can you get? A full-size three-octave keyboard that fits in your pocket. The iSmart “Soft USB MIDI Keyboard Controller” from Taiwanese manufacturer Ta Horng is flexible enough to roll up into a tube, and weighs less than a kilogram. It connects to a computer with USB, which also supplies power.

The iSmart has a minimal but complete set of controls: 37 keys, octave shift, program change, MIDI channel and bank switches. There’s also a velocity switch — presumably the keyboard is not itself velocity sensitive. But who cares when it looks so bizarre?