I contrast I have a wonderful large warring states jade disc which emits a beautiful and long sound when struck. And although visually interesting it is clearly part of a set of different diameters, with a standard motif. And Jade is very tough. This glass is as brittle as hell as I have recently shown. It would just have been too valuable and fragile to treat with anything but the greatest respect.
Here are some more images of tubes and related objects presumably formed at the same time, which may add something to understanding the process of formation, and the reverence with which the best were treated.
This one is about 8 inches long, and the central hole is triangular in cross-section. It has two characters and a kneeling girl on the lower half, and three bulges on the upper half. The lighting effect as you rotate it in sunlight is dramatic
Below are three small tubes. The first is about 4 inches or so long,quite tubby, and has a zhulong on one face, The central hole is hemispherical with a right angle on the other half, and there are three small holes on the opposite side, which contain whitish material. Obviously these were left deliberately.
The next one is unique in that the central hole contains a coating of white material on its walls. I wonder whether this is a coating of amorphous silica. It has a nice cow god, and in every other way is perfectly finished.
This is a tube in opaque glass - opaque because of the mass of bubbles running longitudinally,as well as a large central hole. One end is chipped. Nice incised frog.
This one is run through with lots of fine black to grey holes
This small piece shows how badly they did carving out a hole if there wasn't one there to start with
This last piece is extraordinary. It comtains a flat plane of opaque slightly greenish material, which tapers from one end to the other, The faces are carved with two characters, and at each end is a robed 'priest'
Here you see the line of material sideways on
With oblique lighting the underside looks greenish grey; same on the other face if you turn it over.