Under forvandlingens lov (Under the Law of Change) or Jo tykkere, jo bedre (The Thicker, the Better) is a Norwegian silent film from 1911. It is the oldest known surviving Norwegian film, and it was directed by . The film has been characterized as an erotic melodrama, and it premiered in Kristiania (now Oslo) on December 4, 1911. The script for the film was written by Peter Lykke-Seest under the pseudonym Søløvenskjold Pedersen. In 1992, claimed that Roede's lost 1912 silent film (In the Cage of Freedom) is actually the same film as Under forvandlingens lov.