Constrained by Reality

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• The reality may be physical: you can't go faster than the speed of light, for example, or view the history of the future. (In science fiction, which is art, both are commonplace.)
• It may be historical. Your explanations must use and not contradict known facts.
• In art, whether to obey such constraints is the artist's choice. Even though the artist's medium is physically constrained, the art may create an illusion that such constraints are violated.
  • This is not permissible in research.

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