> My first impression upon seeing Tek's image was that it was photo. Then
> I thought, wait, those rocks somehow resemble the granite pattern. Then
> I remember seeing the entry some time ago :)
> 

You know you have been raytracing too long when you see a render and 
instantly know what patterns were used.

It would be more worrying if you could recognize the isosurface function 
by looking at a shape, though.

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