And Done. --Unofficial Contest: impossible geometr With Robot

Well, I guess it doesn't work on people...
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Rules:
1. Can contains anything.
2. Must be a structure that can work (not appearance only) and impossible to achieve in real world due to geometrical restrictions. For example: endless hallway, looping stairs and so on.
3. Must allow derivatives so I can check it.
4. Must be a derivative of this level.