The work was born within a broader research on color that Maurizio Nannucci began around 1970 and whose objective was the study of the relationship between light and color and its uses and meanings. Made a study on samples of industrially produced colors that pointed out approximate and random results on the possibility of identifying a basic chromatic code, Nannucci sought more convincing answers in the natural field through examples of color in the pure state, being the nature origin and reference of every chromatic fact. Hence the research on green color from the sampling of 60 plants, photographed in full size in a single sample each...