 The duo found inspiration in the distinctive style of Czech animator Jan Svankmajer, as well as old puppet shows.In an interview a decade later, Mayer-Beug would note that elderly people with wrinkled faces - a recurring motif in this film - are one of her favorite subjects to draw.Although the film makes use of computer graphics, both directors carry a strong preference for traditional forms of animation, having once made reference to "the tyranny of software".