Hi Francois,

> What are these blotches on the walls and floor?

I've added some turbulence to the checker-pigment.
The pigment block is like this:
pigment {
    checker color rgb 1 color rgb <0.4,0.2,0.01>
    turbulence 0.0015
}

> Very nice pic, BTW.

Thanks : )

    Thies Heidecke

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