Carla Pereira is an animator and Juanfran Jacinto is a modelmaker and art director. They co-founded the Colectivo Engranaje studio.Carla has worked as a stop motion animator in series such as Clay Kids, Konijn & Konijntje, Twirlywoos, Clangers and El diario de Bita y Cora, in shorts such as El criptozoólogo, Ouróboros and El mar and in films such as the Norwegian Hakkebakkeskogen, the latest film by Wes Anderson, Isle of Dogs or Inzomnia.In the animated feature Os demonios do meu avô, directed by Nuno Beato, Carla worked as an animator and Juanfran as a modelmaker building puppets and workshop manager.They have co-directed the stop motion short film Metamorphosis, nominated in 2020 for the Goya Award for best animated short film and winner of the Biznaga de Plata at the Malaga Festival in the same category.In 2021 Carla directed the short film Selection Process, Biznaga de Plata at the Malaga Festival and nominated for the 2022 Goya Awards. Juanfran was head of the workshop on this short film.