Depicting poignant stories of immigrating to America, the new exhibit “Finding Home: Four Artists’ Journeys” at the Norman Rockwell Museum in Stockbridge, Massachusetts, showcases the journeys and rich family narratives of four renowned artists. For famed author-illustrator David Macaulay, that journey included a transatlantic voyage on board America’s Flagship, the SS United States. That trip, chronicled in his new book, “Crossing on Time: