Another great graphic designer, Pino Tovaglia, a daring experimenter capable of transfiguring prosaic elements from everyday life into what effectively became visual poems, is the “father” of two very famous perpetual calendars. In 1970, when he created Giotto for the historic lighting company Valenti, he had already designed book and magazine covers, posters, a typeface (Forma, in 1968) and a series of memorable advertising campaigns (for Lanerossi, Alitalia and Pirelli, among others). Available in two versions, white and black, Giotto comprises a hard plastic sphere whose central sections rotate, allowing digits and letters to be aligned to form the date. Five years later, in 1975, he produced Calendone, designed for Nava Design and decidedly essential in appearance: the large black numbers on a white background that make the wall calendar so recognizable are also the only information its provides, but it can then be reused year after year.