The film was shot with few resources in 16 mm, even if the post-production was professionally made, especially thanks to the interest of the great director Valerio Zurlini, who fell in love with the project.
The children who made appearance during the shooting in the religious college at the time were the students of the 1st and 3rd grades of the school of Fossalta di Portogruaro (Venice), school year 1965-66.