In response to Peter Cracknell's recent Bear posting... the fur on the left
uses a shell object with a semi-transparent, bumped texture (suitable for
animations):

  union {
    sphere {0, 1 pigment {rgb <.6, .3, .1>}}
    sphere {0, 1 pigment {bozo color_map {[0 rgb <.7, .4, .2>] [.5 rgbt <.7,
.4, .2, 1>]}
      scale <1, 4, 1>/150 warp {turbulence .4 octaves 2}}
      normal {bumps 1 scale <1, 4, 1>/150 warp {turbulence .3 octaves 2}}
      scale 1.06}
    }

while the fur on the right uses fast-rendering noisy media:

  union {
    sphere {0, 1 pigment {rgb <.6, .3, .1>}}
    sphere {0, 1 pigment {rgbf 1} hollow
      interior {media {absorption (1 - <.7, .4, .2>)
        density {spherical color_map {[0 rgb 0] [.1 rgb 5]}}
        intervals 1}}
      scale 1.1}
    }

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