How long does something like this even TAKE to put together? It’s not just a circle, but a damn nice looking one too:
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Applied Geometry: Costco Shopping Carts
Jan 18, 2007 
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This post was written by:
Riyad Kalla - who has written 1727 posts on The “Break it Down” Blog.
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January 18th, 2007 at 10:23 am
And wouldn’t it be fun to be the last guy that gets to muscle his cart in there?
January 19th, 2008 at 3:24 pm
They don’t “muscle” their carts into the circle, they just build a long line of them and bend them, since long lines of shopping carts can curve.