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“Einstein understood all material frames of reference to be relative to each other and to have no absolute material frame of reference to condition them, i.e. he denied the existence of the ether. It never once occurred to him that all material frames of reference are in fact relative to an absolute mental frame of reference, namely that of light, the source of the absolute, the frequency source of the spacetime, material world.” — Thomas Stark
Einstein understood all material frames of reference to be relative to each other and to have no absolute material frame of reference to condition them, i.e. he denied the existence of the ether. It never once occurred to him that all material frames of reference are in fact relative to an absolute mental frame of reference, namely that of light, the source of the absolute, the frequency source of the spacetime, material world.