I also find this a bit curious.  The documentation also has in section 6.7.6 :
"Note:  layered textures must use the texture wrapped around any pigment, normal or
finish statements.  Do not use multiple
pigment, normal or finish statements without putting them inside the texture
statement."

This suggests one should use:
    sphere {
      <0,0,0>, 1
      texture { pigment { Gray75 }  normal { radial frequency 10 } }
      texture { pigment { Gray75 }  normal { gradient y scale .2 } }
    }
Of course, without some transparency I suspect only one of these layers would show.

If one wants to average the textures, then one might use the average "pattern" and a
normal_map.


--
Robert Chaffe
http://www.donovansweb.com/~chaffe/

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