The Lattice Harp
The lattice harp is an experimental electro-acoustic stringed instrument created by Colin Raffel, Diane Douglas, and myself. The harp has 8 tunable strings on each of the two perpendicular dimensions with a dedicated pickup for each string. It also functions as a hardware controller, detecting when two or more strings are physically touching by listening for closed circuits. This allows 64 distinct "buttons" to be triggered. Additionally, the performer can create an interesting "smearing" of triggers by pressing an intersection more firmly, causing neighboring strings to also touch. It is meant to be played either by hand or with metal rods that can also act as conductors for the trigger points.
For a lot more information about the design and construction of the Lattice Harp, read the academic paper here.