Still life: Glass, but no bottles no drinking glasses

Challenge #9 in the Nature and Culture series. Hosted by AndrePooh.
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Show us a still life with glas objects. But no bottles nor drinking glasses, nor anything else that is intended to contain fluids. Remember the title of the challenge series, nature and culture. Be creative. Explain in the description part what we see.
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Thyratron
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This is a thyratron. It is used to generate high voltage for medical x-ray equipment. The glass tube is air tight, and holds in hydrogen gas. This is an example of how we put the laws of nature to use. It is very cool within geek culture.
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Submitted: Wednesday, 7th December, 2011 22:24 (GMT)
Taken: Wednesday, 7th December, 2011
Focal length: 24 mm
Shutter speed: 1/25 sec
Aperture: F4
ISO: 100
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