Different types of existence, eh? I think we're back to Paddy's Hammer here (ten new heads and eight new shafts over the last fifty years) but at least there's no doubt as to its C-or-G existence, likewise the ephemeral organic process of living / being / becoming / growth / decay that all things are prone too, be it Football Teams, Folk Clubs or pinches of salt even though, ultimately, matter can't be created nor destroyed. Existence is for all eternity as it says in The Egyptian Book of the Dead, as quoted on the cover of Myrrh by Robin Williamson (1971). Even in Plato's cave we might assume a degree of commonality with respect of perception, which is always as much subjective as objective - not the same thing with God or Religion of course which is pure Disney.

Culture arises from a common concensus of shared perception. If this wasn't the case it couldn't exist because we'd have no language. Out of language come the concepts and the constructs and the ideologies and theologies and philosophies etc. etc. but the basis of it is common, material and as delightfully tangible as hedgerows, penguins, pigs, pizza, the Herefordshire School of Romanesque Sculpture and Henry Purcell's Chamber Music (a bit of an obsession right now). Thus can fiction writers create entire alternative realities which (like Religion) might give people a good deal of meaning, yet it would be folly for the Phil Rickman fan to visit Hereford Cathedral hoping to catch a glimpse of Merrily Watkins... Or the Iain Rankin fan going up to Edinburgh hoping to buy Rebus a pint in the Oxford... Or the Being Human fan hoping to see a few vampires in Bristol... Or the Shameless fan to go looking for Chatsworth Estate in Manchester...