  However, the concrete versions of ontological contextualism, by attempting to motivate the contextual feature, ruin FM. Version (a) allows f(Q) to be switched ‘on and off’ or to switch between different values upon the change between P- and Q-measurement situations — which is a flagrant violation of FM. Version (b) fares no better. It introduces the ontological dependence on the measuring arrangement. It is hard to see what else this should be, but the same causal dependence pushed to a higher, ‘ontological’ key.  Again, could we not, just by flipping back and forth the measurement arrangement, change back and forth whether f(Q) is well-defined, thus flip v(f(Q)) in and out of existence?