The group CaCO3 was founded in 2006 on the initiative of three artists, Âniko Ferreira da Silva, Giuseppe Donnaloia, and Pavlos Mavromatidis, after having shared the experience of training at the "School for the Restoration of Mosaics" in Ravenna. The chemical formula for calcium carbonate, or limestone, the name CaCO3 refers to a raw material commonly used for the creation of mosaics. The study and practice of traditional techniques, as well as direct contact with mosaic works of the past, made possible during the years of study and work experience in restoration sites, contribute to the sharing of a common reflection on the formal aspects of mosaics and their elaboration, aimed at finding new possible relationships between light and matter.