1. quasinonymous reblogged this from fierceawakening and added:
    I’m told that, if a lip is placed in the manhole hole, a circular manhole cover cannot be rotated or tilted such that it...
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  19. formerfbiagentbatman reblogged this from fierceawakening and added:
    It’s because if they were any other shape they have the possibility of falling and hitting someone or something. But...
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  23. lilyvandersteen said: I would never have thought of that. Thank you!
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  27. lucy8675309 reblogged this from lilyvandersteen and added:
    Geometry— a circle has a consistent diameter so there is no way the cover can fall into the hole. If it were a square or...
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  31. lackhand said: So that you can’t drop them into the hole (any other convex shape would have a skinnier and thicker side, so if you got the angle wrong…)
  32. lilyvandersteen reblogged this from fierceawakening and added:
    Maybe because if it were square, it would be indistinguishable from the pavement?...Now I...
  33. otomeberry said: I guess so they can easily fit back into place.
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  36. fierceawakening reblogged this from fatsexybitch and added:
    "Because circles are aesthetically pleasing."......May I...