The floor is lava

One of Steve's numerous nightmares...

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^{Some textures from Minecraft - trademark of Mojang AB
Programs used: SketchUp for modeling, Kerkythea for rendering and Paint.NET for image editing.
2 renders, render times: 13h 55m 22s (MLT(BPT) - 110 passes × 4 threads) + 14h 12m 32s (MLT(BPT) - 50 passes × 4 threads)}