These spheres look great on a black background, but when I put them on a
grey one, they look horrible.  Why is this?

material {
  texture {
    pigment {
      agate
      color_map {
        [0 rgbt <.1, .1, 1, .8>]
        [1 rgbt 1]
      }
      agate_turb .4
    }
    finish {
      phong .3
      phong_size 80
      ambient 0.1
      diffuse 0.1
      reflection .25
      specular 1
      roughness 0.001
    }
  }
  interior {
    ior 1.3
    media {
      emission rgb <.05, .05, .5>
      density {
        radial
        color_map {
          [0 rgbt <0, 0, 0, 0>]
          [1 rgbt 1]
        }
        frequency 5
        turbulence .6
      }
    }
  }
}

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