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Second Life

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There are some Escher style impossible constructions in online 3D virtual world Second Life.

First, there's nice sculpture of impossible cube at the Shengri La Peace.

Impossible cube at Shengri La Peace
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Also, there are two three-dimensional implementations of Escher's artwork "Relativity" at Smallville Heights and Neko Valley.

Relativity at Smallville Heights
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Relativity at Neko Valley
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See also a model of Escher's Waterfall in Second Life by Merlino Mayo (immersiva)