I've always thought of the project as a sort of sexually driven digestive system, that it was a consumer and a producer of matter. And it is desire driven, rather than driven by hunger or anything like that.
Anything you strike, anything you shake or rattle, or just anything that can be picked up, and you can create a sound.
I don't really shop any more. I only do it when I have to. I think it is very overrated.