 Based on concepts which mostly originated with Postgate, Firmin did the artwork and built the models, while Postgate wrote the scripts, did the stop motion filming and many of the voices.Smallfilms was therefore able to produce two minutes of film per day, ten times as much as a conventional animation studio, with Postgate moving the cardboard pieces himself, and working his 16mm camera frame-by-frame with a home-made clicker.As Postgate voiced many of the productions, and also narrated WereBear stories, his distinctive voice became familiar to generations of children.