T he thing about unfilmable works of literature is that most of them eventually turn out to be quite filmable after all. The Lord of the Rings was a bit of a mess when shot in rotoscope on a minuscule budget by the guy who filmed Fritz the Cat; it won Oscars when handed to Peter Jackson, given the GDP of a small nation and a visual effects department the size of Gondor. The 1984 version of Dune was a disappointment, despite the presence of David Lynch in the director’s chair, largely because all that gleaming, tawdry galactic opulence couldn’t make up for the comprehensively bad acting, clotted exposition and obsession with freaky heart plugs. And yet the 2021 adaptation from Denis Villeneuve ended up being a tour de force of masterly restraint and monolithic scale. Milton’s Paradise Lost? The 17th-century epic poem has always felt like an outlier, a work of literature too religiously inspired to be filmed purely as a work of fantasy, yet too riotously bonkers to be treated with puritanical reverence.…