Audio Graffiti

The standard speed for cassette tapes is 1⁷⁄₈ inch per second. This is slow enough that it could be drawn by hand. What if the magnetic surface was still and the read/write head moved instead? We could mix ferric oxide powder (the ferromagnetic material used in cassette tapes) with some sort of paint, spread it on walls, and use modified walkmen to record and read messages from it. I'd like to see this as a performance tool, too, for recording and retreiving "physically stored" samples in real time — "scratching" them, even.

This could also be considered an extension of Audio Bombing.