Jan used to be afraid of heights. He recalled his hands shaking as he stood teetering on the side of a 9-story apartment building, painting his illusionistic murals on a grand scale, nervously wielding paint-filled aerosol cans. A wellspring of creative talent, graffiti artist Jan Heinsbroek, from Utrecht, Netherlands, in 2016 transformed that apartment into what might pass for a cubby-hole shelf owned by the giant from “Jack and the Beanstalk.” Tucked inside each “little” nook were painted an assortment of odd and interesting trinkets, a wonderous feast for the eye. This 3D mural on the side of the building spruced up an otherwise blasé neighborhood. Tucked in each shadow box were a teddy bear, a Roman bust, pieces of Asian pottery, glass birds, a picture frame, and a singing frog playing the banjo—all portrayed with such illusionism that, standing back 100 feet, that drab, utterly mundane apartment magically sprang …