 According to the causal and dispositional accounts too, this putative computational implementation is spurious, because the physical state transitions are not due to causal or dispositional properties of the rock and its states. T does not cause T+1, nor does the rock have a disposition to go into T+1 when it is in T. Rather, the rock changes its state due to the action of the sun. Since the rock’s physical state transitions that map onto the NOT gate’s computational state transitions are not grounded in either the causal or dispositional properties of the rock and its states, the rock does not implement the NOT gate according to the causal and dispositional accounts.