People who keep an active, physical connection to someone they’ve lost — a garden, a bench, a tree — tend to process grief more fully than those who don’t, according to continuing bonds theory, formalized by Klass, Silverman, and Nickman in 1996. A couple in Asheville, North Carolina, didn’t know that when they signed their mortgage. They just knew the seller wouldn’t take their offer unless they promised never to cut down the magnolia tree.