The aspects of William Mortensen’s photography that were controversial during his lifetime—clever manipulation of imagery and dark themes—are now considered to be marks of his greatness. In the show “Witches” at Buckland Museum of Witchcraft and Magick, Stephen Romano Gallery offers both unseen work and iconic meditations on the occult from his output in the 1920s and ’30s. The exhibition runs August 3 through November 3 at the venue in Cleveland, Ohio.