Do you ever walk into a room that just feels right? Maybe you can’t quite put your finger on it, but it has a certain something that makes it seem balanced and comfortable while still interesting. Betsy Helm and Kiley Braun of Shophouse Design, this month’s Next Wave firm, are experts in achieving that feeling—a skill they describe as giving a home a soul. While they’re best known for their expert use of millwork (as eye-catching decor as well as functional storage), the duo also have quite a few other design tricks that contribute to their gorgeous interiors. One of the simplest? Always use a touch of black in every room.