I think this is such a great idea. I don't know why, but I really like street installation art. (I've had a link to some of it on this blog for a long time... check out my trash on the left side.) Some of his aren't great, but I think a lot of them look really good. I stole these from http://v1kram.posterous.com/liu-bolinthe-invisible-man
Check out the rest, the tractor is by FAR the best one to me.
The last one gets me every time! He's from Shandong, China. I think he's the bomb.