OBJECT LESSONS was inspired by an eccentric Chicago heiress named Frances Glessner Lee. In the 1940’s, Lee designed 18 miniature models of crime scenes to train police investigators. Built to the scale of one inch to one foot, and complete with tiny victims, Lee’s dioramas are enigmas begging to be solved. Here are Lily Sparks’ favorites: 1: Three-Room Dwelling: Robert and Kate Judson, and their baby Linda Mae, are shot to death in their tidy little house. Their phone is off the hook, the table’s set for breakfast, the murder weapon—a rifle—is on the kitchen floor, and both doors are locked from inside. 2: Attic: Miss Jessie Comptom, a spinster, hangs from a rafter in her attic. Old letters and other relics of her past are scattered beneath her. One shoe dangles from her foot; its mate is on the stairs. 3: Dark Bathroom: Maggie Wilson lies face-up in a bathtub in a rooming house. Fully clothed, she appears to have fallen in backward. She had two male visitors that night, and there’s a liquor bottle on the floor. 4: Kitchen: Mrs. Robin Barnes lies on her kitchen floor. The stove’s gas jets are open, and her face has a rosy…