The present model was exhibited at the Barcelona International Exhibition, 1929; the IV Monza Triennale, 1930; and the Tentoonstelling van glas, aardewerk en kant, van moderne Italiaansche kunstnijverheid, 1931.

Executed in Venini's Murano studios, the present model was designed by Martinuzzi shortly before his departure from the company in 1932. Made in Martinuzzi’s distinctive pulegoso glass, the opaque effect was created by adding a substance, usually bicarbonate of soda, to the molten glass paste. The resulting reaction produces irregular air bubbles which lend the glass its spongy appearance and enables unusual chromatic effects. The present pair of ceiling lights are a rare example of Martinuzzi’s use of this technique for a light fixture.