Among the various problems cited in the competition announcement, the noise of traffic from the large boulevard bordering the projected park was certainly important. Mazzucconi presented an original solution, rich in meaning for the city. Having discovered that a portion ofthe ancient city’s walls had been located in the area, he studied and revived the idea of the walls, to be materialized in a new form, large enough to contain guided trails, glasshouses and other functions dictated by the competition. Another idea was on behalf of of the millions of animals killed in the slaughterhouses previously existing on the site. Mazzucconi’s project presented a memorial to remember these creatures, in the form of the Arca delle Halles (whose apocalyptic sense also reveals itself in this analogy with the ark that Noah built to house all of the animals), once again proposed for Paris and once again refused.