“…Observing a few fragments of extra-thick glass, the ‘cotissi’ of Venini’s furnace in Murano, I had the idea and the desire to turn them into window-panes by exploiting the ‘inner play’ of the thick glass, broken up with empty bubbles, with inserted segments of various kinds of coloured paste, let into the depths of the frozen body of the glass. These stained-glass windows made of blocks of glass were extremely heavy, therefore it was not possible to join the blocks together in the usual way by means of lead settings, and so I planned to have them supported by vertical steel guides. And here you have the new stained-glass in which free play is allowed not only to the transparency of the colors but also the refraction due to the outer form of the blocks and their inner surfaces…” Gio Ponti, as published in Domus, March 1966, p. 26