Lloyd studied colors and microscopy, and was very involved with photography, including 3D photography and color film experiments. Some of the earliest 2-color Technicolor tests were shot at his Beverly Hills home (these are included as extra material in the "Harold Lloyd Comedy Collection" DVD Box Set). He became known for his nude photographs of models, such as Bettie Page and stripper Dixie Evans, for a number of men's magazines. He also took photos of Marilyn Monroe lounging at his pool in a bathing suit, which were published after her death. In 2004, his granddaughter Suzanne produced a book of selections from his photographs, "Harold Lloyd's Hollywood Nudes in 3D!" ().