GEFF, Genre Experimental Film Festival, was international experimental film festival organized from 1963 to 1970 in Zagreb, Croatia. GEFF was established after a series of debates between experimental filmmakers held at the Kino Club in Zagreb entitled “Anti-film and Us,” which was led by Mihovil Pansini, leading experimental film author. Anti-film was a type of film that was more focused on the pure acts of research and discovery, delving into its self-reflexive media language rather than any expression or communication happening between artist and viewer. Anti-film represented a radical annihilation of conventional film, its elements, principals and structure. GEFF became a worldwide locus for non-professional and experimental filmmakers.