The animated postcard was a genre of card that had its greatest success in the first decade of the 20th century. Post cards were affordable mass communication, sent simply and as frequently as a text message today. The animated postcard was unique in that the images moved.
The techniques used to marble techniques were kept secret for most of the history of this craft. Assistants were each taught only part of the process, so that they could not go out on their own and compete with the master.