But that’s not enough to fully catch his polyhedric and enthusiastic attitude towards his job and his passions. Gianni Cagnazzo is president of IEM (Indoor Environment Management) and ANAB (National Association of Bio-ecological Architecture), member of the International Academy of Colour, he is professor in bio-ecological architecture, colour design and humanisation of the built space, he gives lectures at various institutes, including ANAB IBN (Institut fur Baubiologie und Oekologie – Neuberern), UNITRE, University of Turin… Colour is his passion, therefore the question was certainly due: What is colour?