Animation studio
Lornsen's books were translated into numerous languages, including Greek, Japanese and Norwegian. In 1980, his "Jakobus Nimmersatt" was adapted by Japan's Nippon Animation studio into a TV special, "Nodoka Mori no Dobutsu Daisakusen" ("The Great Plan of the Animals of Placid Forest"), directed by Yoshio Kuroda; the special was released in English under two different titles, "Back to the Forest" and "Peter of Placid Forest".