(as above), then it seems to follow that few of us now (and none in the not too distant past) know enough to have the concept of seeing; whereas if the standard process is defined as the most common process by which the scene before the eyes causes matching visual experience, whatever that may be, then it seems to follow that any of our examples of veridical hallucination might have been a case of seeing, and what I am doing now might not have been, if only the frequencies had been a bit different.