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Plumbob creating designs in sand?

  1. Jul 28, 2009 #1
    I was at a large craft convention in Asheville, NC a few days ago, and I saw somebody that had attached a plumb bob to a string, and had a hook-like thing on top of it sitting on a piece of wood, which allowed the string to just hang there and spin around the hook center. The plumb bob's tip was in a plate of sand, and throughout the day it would slowly made designs in the sand.

    How does this happen?
     
  2. jcsd
  3. Jul 28, 2009 #2

    mgb_phys

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  4. Jul 28, 2009 #3

    Andy Resnick

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