Under optimal conditions, I heard elsewhere, the eye can detect and register a single photon. This suggests a quantum setup involving a single-photon emitter, a half-silvered mirror and two people in separate rooms as photon detectors. Probably only art, not physically possible to isolate the people from affecting the world when they see or not see the photon.
Vaguely inspired by Schroedinger's cat, though no poison.
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