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Originally Posted by Dagwolf
The rolling makes sense; those suckers are heavy! Except I think you meant impossible to fit through? I don't see why I couldn't go through a square or hexagonal hole just as easily.
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No, it's a geometry type thing
if manholes and manhole covers were square and a big truck ran over it and cocked it up and turned it on its side it's possible for it to fall in, thus leaving a big dangerous hole
round ones can't do that, it's physically impossible