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As to the question of whether we are living in a simulated reality or a ' real ' one, the answer may be ' indistinguishable ', in principle.

In a commemorative article dedicated to the ' The World Year of Physics 2005 ', physicist Bin-Guang Ma proposed the theory of ' Relativity of reality '.

The notion appears in ancient philosophy: Zhuangzi's ' Butterfly Dream ', and analytical psychology.

Without special knowledge of a reference world, one cannot say with absolute skeptical certainty one is experiencing " reality ".