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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Coal Sifter
by Infared
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Shot inside an abandoned coal-sifting plant, using only available light. Plant is located in northeastern PA near Shenandoah. Strip mining is part of the culture of a large part of the surrounding area.
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Submitted: Tuesday, 6th December, 2011 21:39 (GMT)
Taken: Sunday, 4th December, 2011
Focal length: 50 mm
Shutter speed: 13/10 sec
Aperture: F11
ISO: 100
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