 Notice that it is not incumbent upon Vasubandhu here to prove that all instances of the merely apparent transcend the limitations assumed by the objector. He has not set up this objection in order to try to prove, absurdly, that all mental images, for instance, are spatially restricted, or that all mere appearances perform observable causal functions in the real world. On the contrary, one upshot of the recognition that things are appearance only will be that things do not have the cause-and-effect structure that we ordinarily take them to have. In any event, the positive argument that ordinary experience is, in fact, illusory, comes later and takes the form of an argument to the best explanation. Before an explanation can be the best, though, it must be a possibility. So here, all Vasubandhu must do to counter these initial objections is provide, for each, a single example of a mental event that exemplifies the behavior that the objector claims is only available to physical  objects.[36]