“C. S. Lewis called it the “inconsolable longing” for we know not what, or Sehnsucht, a German term based on the words das Sehnen (“the yearning”) and sucht (“an obsession or addiction”). Sehnsucht was the animating force of Lewis’s life and career. It was “that unnameable something, desire for which pierces us like a rapier at the smell of bonfire, the sound of wild ducks flying overhead, the title of The Well at the World’s End, the opening lines of ‘Kubla Khan,’ the morning cobwebs in late summer, or the noise of falling waves.” He’d felt it first as a young boy, when his brother brought him a toy garden in the form of an old biscuit tin filled with moss and flowers, and he was overcome by a joyous ache he couldn’t understand, though he would try for the rest of his life to put it into words, to find its source, to seek the company of kindred spirits who’d known the same wondrous “stabs of joy.”