...and here are 4 variations one can produce using the three materials zones (wall, roundel, and plate). I applied a simple wood texture to each zone, first the wall, then the roundel and finally the inner plate. In the lower right image, I removed the trans-mapped, rendering an inner surface flush with that of the main wall. Of course, one can apply other maps light marbled patterns, as well as reflection maps. Sincerely, Bill

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Tempt the Hand of Fate and it'll give you the "finger"!