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Symmetry is dual to conservation -- the duality of Noether's theorem. Simultaneity is dual to relativity -- Einstein.Same is dual to different.Time dilation is dual to length contraction -- Einstein, special relativity.Space is dual to time -- Einstein.Absolute time (Galileo) is dual to relative time (Einstein) -- time duality."Always two there are" -- Yoda.Simultaneous events are observer dependent or relative to the observer.The observed is dual to the observer -- David Bohm.