Is “the two-person collaboration… the essential creative act”? Joshua Wolf Shenk thinks so, and he’s written a book defending his position, aptly titled The Powers of Two: Finding the Essence of Innovation in Creative Pairs. While John Lennon and Paul McCartney are his primary examples and the root of his argument, famous author duos are also referenced – C.S. Lewis and J. R. R. Tolkien, for one. Shenk even “works to transform even famously lonely figures — Rainer Maria Rilke, Emily Dickinson, Martin Luther King Jr. — into one side of a duet.” Consider us skeptical but intrigued.