This is high poly glass ceiling light.Stack not collapsed.Some info about this light:Have you ever seen Shar Pei puppies? These sheaths of wrinkled crystal take their cues from them, but the “cute factor” is replaced by a stunning and elegant display of light through a top quality crystal. With a lenghtof approx. 52cm/20.5” and diameter of 10 cm/3.9”, they can alsobe grouped together to further highlight the mesmerizing, undulating surface.