Brightly coloured birds populate branches made of glass, other transparent birds conceal a soul of rainbow colours (‘sbruffi’); and while the parrots appear jealous of their chromatic qualities, the groups of penguins look amazed at their own feathers. In addition to the use of gold and of calcedonio which, for example, highlights the motion of the horses, or the inclusion of murine used for
the eyes of the pelicans, with their silk white bodies and pink beaks, many works experiment with specific recipes generated personally in the furnace by Oscar, as in “Notte Boreale”, a glass that ranges from an intense blue-grey to the purity of transparency.