The filming of Ventana began as a test of the rewind and superimposition functions of the Single 8 camera: a crescendo of added layers. The space is a camera obscura in which the cameraman's movements convert a line of light into multidirectional rays. Toward the end there are up to eight unique superimpositions and single frames. The music was added in 1989, with an anaogue synthesizer and digital delay.
During World War I, a German U-boat sinks a British ship and takes the survivors on board. After it takes a wrong turn, the submarine takes them to the unknown land of Caprona, where they find dinosaurs and neanderthals.
In Montauban in 1944, Julien Dandieu in a surgeon in the local hospital. Frightened by the German army entering Montauban, he asks his friend Francois to drive his wife and his daughter in the back country village where Julien has an old castle.