German artist Nikolaj Arndt created Crocodiles Eat, an amazing anamorphic 3D painting that was installed on a floor inside of a home. You can see more of Arndt’s work at his DeviantArt gallery.
This is what the painting looks like from the reverse side:
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On the Propadeucist, "objects that are guns - and are also other weapons," including a gun that is also several other guns.