The series "TRIANGOLO" by VENINI VETRI DI ARTE from Murano was around 1965 in the program. Freely suspended glass prisms with a perfect surface to create the largest possible reflections in the glass, on the one hand by the light produced in the lamp as well as the captured ambient light. The effect was also increased by the free-swinging prisms, which vibrate easily in the draft.
This offer is a 30 cm diameter luminaire. A second, larger luminaire of the same type can be found here.