Not commercially distributed.
Cage cups were made by Roman glasscutters in the fourth century A.D. The entire vessel was cut from a thick-walled glass hemisphere. The metal attachments show that the object was a hanging lamp. Imagine the shadows the "cage" would have cast as the lamplight flickered.
Narrator, William Gudenrath, resident advisor, The Studio, The Corning Museum of Glass.
Title from resource description page.
Mode of access: internet.