The WALLS experience begins in 2008. The professionals derived from different associations and previous experience in the field of Contemporary Art and the Public art. Zerouno3nove’s experience, an association dedicated exclusively to public art, from the beginning merge in the new association as fully its curriculum, including the Qart project held mainly in train station of Rome, for the curatorial continuity that characterized the two associations. During the day “Clean Up the World” promoted by Legambiente, zerouno3nove has been engaged in the graphic requalification of the small playground Acquedotto Alessandrino; a positive message on how the Public Art can be an action to improve and upgrade landscape.