Recording a musical performance in 3D -- live

[johanw 0]

I have this idea that I'd like to throw out to see whether anyone might take an interest:

How about recording a concert, while it's happening, by feeding streaming sound to the printer? At the end of the show, you would have a representation of what went on as a (hopefully interesting) piece of plastic.

It's essential that the "recording" should be done in real time.

I don't know whether this has been done before. Anyone?

(I.e., converting a waveform primarily into 2D movements, and then at select points making a Z step. No upfront planning allowed.)