Microtonal Network

Most fans of experimental string instruments are familiar with the StarrBoard, an invention of luthier, microtonalist, and mathematician John Starrett:

http://infohost.nmt.edu/~jstarret/StarrBoard.html

One of John's clients, Tim Meeks, liked his so much that he has now started a company making them, with a bit more fancy woodworking. You can check them out here:

http://www.marcodi.com/