If, however, I assert that I have a real headache, I claim only that my headache exists, not that it would exist even if unperceived. A headache that I don’t perceive is no headache at all. I wouldn’t mind that kind of “headache,” of course. But if you tell me that my migraine is not real because it doesn’t exist unperceived, I’m liable to become quite cross with you, and for good reason.
