They are made out of meat
 

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http://www.youtube.com/watch?v=V-NAvPzdjj0

I love it! It's like a vonnegut short story.

Wow, really cool! It is from a short story called "Alien/Nation" by Terry Bisson.

The video was done very well - had a real David Lynch feel to it...

Very cool. Thanks for the post.