I had no idea, but it certainly makes sense.
Norman Rockwell was a 20th century American painter and illustrator. His works enjoy a broad popular appeal in the United States, where Rockwell is most famous for the cover illustrations of everyday life scenarios he created for The Saturday Evening Post magazine over more than four decades.(from Photo District News via Presurfer)
Norman Rockwell's rosy illustrations of small town American life looked so photographic because his method was to copy photographs that he conceived and meticulously directed, working with various photographers and using friends and neighbors as his models.
here's the full story on NPR. "Behind The Lens: Norman Rockwell's Photographers, A Mixed Picture"