Amit Pitaru’s Sonic Wire Sculptor turn drawing in 3D into sound. Originally developed in Windows (here), it now has a pretty cool iphone app here. Notice how far the project has gone!

In the iphone screen shot above, horizontal lines separate notes in scale. Timbre of notes can be chosen to express sound differently.

Frankly I was worried to read the title of the project on Programming Interactivity (P195); it turns out to implement it in the opposite direction 😛 Still, it demonstrates that mapping pitch and wire shape makes sense! Additionally, in the windows version, stylus pressure is mapped to line width, and loudness of music.