The "Mermaid Bridge", built in 1840-42, was thought to be a crossing point in the "Inner Canal Circle" of Milan, between the Corso Porta Tosa and Via San Damiano bridges. With the buriyng of the canals between 1929 and 1930, being the new city project being implemented. It was however moved where it is today, in the Sempione Park. It was shortened and, during the years it was heavily modified: the railing was immediately changed - the one appearing in teh film - while two out of four mermaids went lost, one under the bombs and the other stolen. Both were put back in 1954, and since 2003 a copy of the original railing has been built in. The tremors in the image, which produces that quick and continuous vertical swinging, is due to a bad film loading in the camera: since the "loop" wasn't formed - a segment of film where it is not strained - the film is in a constant tension state, and it is impossibile for it to be still in front of the gate.