The light switches are original as they are made of the same material as the base of the lamps. The switch of the Mezzoracolo offers the possibility to switch on / off the lightbulbs in the globe and the base independently of each other.
L'oracolo in Messenia is a 1738 opera by Antonio Vivaldi to a libretto by Apostolo Zeno. The opera was composed for the autumn Venetian carnival season of 1738 after Vivaldi took over the Teatro San Angelo from the impresario who had managed it the year before.[1][2]