By the way, if it will help here is the plane that I'm currently using:

  #declare Foo = function {min(abs(x)-int(abs(x)),abs(z)-int(abs(z)),
                 1-(abs(x)-int(abs(x))),1-(abs(z)-int(abs(z))))}

  #declare grid = plane {y, 0
    pigment {
      function { Foo(x, y, z) }
      color_map {
        [0 color White]
        [0.01 color White]
        [0.02 rgb <0, 0.05, 0>]
        [0.98 rgb <0,0.05, 0>]
        [0.99 color White]
        [1 color White]
      }
    scale 500
    }
    normal { bumps 0.01 scale 30 }
    finish {
      ambient .1
      diffuse .5
      reflection .55
      specular 1
      phong 1
    }
  }

I'm thinking that something that disturbs the whole surface or maybe even
something that just grabs and disturbs the grid lines would work equally
well.  Ideally this is something I might like to animate but that is
probably something I can work out after I figure out how to get the effect
I want.

Thanks,
Carl

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