This is a vintage glass ceiling light, probably made in Murano by Barovier & Toso, dating back to the 1950s or 1960s. This type of lamp, often made of blown or hand-cut glass, is highly sought after in the antiques and modern art markets. The lampshade is made of clear, textured glass with a ribbed or "granilla" pattern that diffuses light in a unique way. Its elegant classic-modern design is typical of mid-20th-century Italian furniture. Similar models have been attributed to renowned designers and glassmakers such as Barovier & Toso, Venini and Seguso. It features a central gold brass knob for mounting. It can be installed on the ceiling (ceiling light) or on the wall (applique).