For the exhibition dedicated to Mario Comensoli, Artrust created a special guestbook: the classic dedication book for guests has been replaced by en entire wall painted with a special substance that allows to write on it as on a blackboard. Many people left their signature and a few words to commemorate the exhibition dedicated to the famous Swiss painter. Amon them, in addition to the artist Ivo Soldini and his distinctive sketch, it is possible to recognize the TV presenter Julie Arlin, the art critic Pietro Bellasi and the President of the Comensoli Foundation, Mario Barino.