The group CaCO3 was founded in 2006 on the initiative of three artists, Aniko 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. Chemical formula of calcium carbonate, or limestone, the name CaCO3 refers to a raw material commonly used for the realization of the mosaics. The study and practice of traditional technique and the direct contact with the mosaic works of the past, made ​​possible during the years of study and work experience in restoration sites, contributes to the sharing of a common reflection on the formal aspects of the mosaic and their elaboration, aimed at finding new possible relationships between light and matter.