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I suppose the thing that keeps Bosch from being the first surrealist is his ostensible belief in some kind of truth to his images, biblical authority. But which the surrealists too - under a new bible, manifesto - also led a new moralizing order. Maybe you can't paint humanoids and skulls without some small redistribution of sense. Which is why Tarot cards are such powerful meaning creation devices - humans are apophenic machines - seeing sense where there may be none, they create it for themselves. Art comes to resemble it.
See too: Caitlin Keogh at Bortolami