Ponti with an early model of the Pirelli Tower, January 1955. This version, with greater expanses of transparent glazing, was more in keeping with Ponti’s idea which, in his words, would eliminate the horizontal “striped-pajama” effect. To Ponti’s displeasure, Alberto Pirelli insisted on the use of intervals of opaque glass, to prevent anyone looking up the skirts of female employees. Photo © Gio Ponti Archives/ Historical Archive of Ponti’s Heirs (Photo Publifoto).