IT’S USUALLY BETTER to have a blank canvas when creating a work of art. A clear parcel of land where windows can be oriented to frame views. Or an empty room where walls can be moved to create an entirely new space. But if you must work within the confines of an existing structure, you hope for an inspiring design, a history to guide you and a homeowner willing to take creative risks. — Having fallen in love with the home’s existing architecture, the couple turned to interior designer Lori Gentile to enhance its best features and make it livable for a modern family with traditional values. The goal: Blend high design with comfort.