What is "risalto"

RisAlto is an international exposition of contemporary art that was organized annually in Camino, Piedmont's medieval castle between 2001 and 2010. The project is an idea of the artists Marco Porta and Mari Brignolo. Risalto was the first modern art exhibition in the world that presented mosaics reproduced exclusively with colored rice. International artists were invited to design the mosaics, that were then produced by the creators of the event in collaboration with the artists.