THE LANGUAGE OF LIGHTThe language of light was written by Antonio Petrillo, who dedicated the last years of his short life to its drafting. Antonio was a friend of mine and a teacher and I applied his teachings about light and lighting of artworks during many years of my career. I had long promised to dear Luisa, Antonios wife, to publish his unreleased work but I never found the time and serenity to handle it due my work and teaching. I do it now, taking advantage also