Garry pointed me to Percussa AudioCubes. These cubes communicate by infrared to communicate distance information that you can use as input.
Location, orientation and distance information is passed to the software, while you interact with the cubes. The software can connect via MIDI or OpenSoundControl (OSC) to any software or hardware for music or visuals which you already have, or you can use it within your DAW (digital audio workstation) software as a VST plugin, or as a host for VST instruments to let you create sound immediately. (From How do they work?)