Mike O.'s Comments
London Calling changed my life, but Mondo Bongo was more than that even. Joe was important in so many ways.
http://art-commerce.blogspot.com/2008/07/joe.html
http://art-commerce.blogspot.com/2008/07/joe.html
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Also, as a couple of others have pointed out, Fischli and Weiss made their "trash" from other materials. It's a classic example of representation. Anybody interested might want to check out this snippet of their great Rube Goldberg-meets-an-alchemist video "The way things go": http://www.youtube.com/watch?v=AA0mFjJbNH8 If you can see the whole shebang, you'll probably agree that it's exceptional.
Sometimes an attempt to communicate via images or objects fails. That's usually because the (visual) vocabulary of the artist is not aligned enough with the viewer. Things like that just happen -- like a foul tip in baseball. When it happens, it's not a reason to condemn either the pitcher or the batter. It's only a chance to look at the event in the meaning-making-understanding game.