As national debate rages about the Confederate flag, a peculiar installation of that controversial banner may be hiding in plain sight – inside the cushion of Abraham Lincoln’s rocking chair, a replica that rests in a balcony box in the re-built Ford’s Theatre in Washington, D.C. The theatre—a functioning play space and a museum—reopened in 1968, 103 years after President Lincoln died by gunfire in April of 1865 at the end of the Civil War while he watched a play there. The builder of the replica chair—a now-deceased craftsman named Carlton McLendon—lived in Montgomery, Ala. and felt bitter toward the...