Fact: POV-Ray can use an image as a pigment.
Fact: POV-Ray can use a pigment as a function.
Fact: POV-Ray can use a function as a pigment.

In spite of the above, I can't seem to get POV-Ray to load an image as a 
pigment, turn the pigment into a function, and then turn the function 
back into a pigment again. (I want to **** around with the coordinates.)

Any hints?

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