Macabre skeletons dancing to unheard tunes. An oversized eyeball peering into a window. One hundred years ago artists such as Henry Moore, Leonora Carrington, Paul Nash, and Francis Bacon—reacting to life in the wake of W.W. I—began making art that was revolutionary in its departure from reality. A new exhibition surveys 70 Surrealist works from British artists integral to the movement. —J.V.