The rotoscope projected motion picture film through an opening in the easel, covered by a glass pane serving as a drawing surface.
The Inkwell Imps series was replaced by the "Talkartoons" in 1929, and Koko was retired until 1931, appearing as a supporting character with Bimbo and Betty Boop.
Koko's last theatrical appearance was in the Betty Boop cartoon Ha-Ha-Ha (1934), a remake of the silent Out of the Inkwell film The Cure (1924).
In 1958, Max Fleischer revived his studio in a partnership with Hal Seeger, and in 1960 produced a series of one hundred Out Of The Inkwell five-minute cartoons.
[5] In 2024, the short Ko-Ko's Earth Control was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant".