 The other proposal denies that basic physical processes are time symmetric and argues, in contrast, that the causal asymmetry is objective and therefore that there exists an intrinsic difference between the cause and the effect of all physical processes. John Earman (1967b and 1969) may be the first who argued against the interpretation that time reversal invariance of processes is identical with invariance under the exchange of the temporal order between earlier and later. Two reversed tokens of the same type of physical process do not developed in the opposite direction of time.