I have a white blob inside a character's mouth. I want it to look like
teeth.  The normal gradient x doesn't give the effect I want: it looks
like narrow teeth with wide gaps and I want the opposite.

Any ideas on a quick change:  I actually wish there were an INVERSE
command here!

I've summarized the problem with the following code:

//
cylinder {z*3-y,z*3,1 pigment {rgb 1}
        normal{gradient x frequency 10}
        }

light_source{-10*z+10*x rgb 1}

//

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