Warhol would do things like mass-produce objects that looked very much like other things, example: screen printed Brillo Boxes - and then photograph them in say, a super market. It's similar, but different - Duchamp, as the story goes, would just buy the object and call it art. There's some controversy over that, as some of these Found Objects aren't so commonplace, but have key differences in them, to make them more aesthetically pleasing - they may be actually one-ofs, that only
look like something commonplace and mass-produced, giving Duchamp the last laugh. That's what happens, when a chess player starts makin' art!
Also see the Warhol's Campbell Soup cans - he just really liked Campbell tomato soup. Speaking of canned things, see, Piero Manzoni's "Canned Shit", where, well, it's what it says on the tin, I guess. I guess, as I haven't actually opened one, myself,
http://en.wikipedia.org/wiki/Artist%27s_Shit
Warhol would use many different mass-production (cheap!) techniques to produce his art. One of my favorites is xerox'd photographs of flowers, he would almost give away for free - certain that they would be both collectable, and that people would simply throw them away, because hey: it's just some cheap photocopy. The one's that survive are worth quite a bit. Incidentally, he didn't get the copyright to the original photograph, so lost money on the whole thing.
I think warhol's biggest, "Readymades" were the actors of his films, who would get little, if any direction and they would just film them doing their thing. See, "Chelsea Girls"
> Justin, (author of Dada Mail)