Much has been written about the writer’s cabin. Among the most notable recent books on the topic are “Heidegger’s Hut” by Adam Sharr and “A Place of My Own: The Architecture of Daydreams,” Michael Pollan’s account of  imagining and then actually constructing his own writing space. A standard Internet search can quickly yield images of the writing rooms (cabins, huts, sheds) of legendary scriveners: Dylan Thomas, Virginia Woolf, Ludwig Wittgenstein, Roald Dahl, Carl Jung, Henry Thoreau and — a writer of a markedly different sort —Ted Kaczynski, to name a few. And Jill Krementz’s 1999 collection of photographs “The Writer’s Desk” gives us tantalizing glimpses of writers sitting at their desks. But why the interest? Have these places somehow become secular sites of the sacred?