Geometric shapes in our life

Challenge #6 in the Places I have seen, people I have met series. Hosted by paradiso.
Challenge has finished
The geometric shape/pattern can be made of anything. Lines, circles, squares, triangles, etc. Abstract works are not allowed, the geometric shape must something present in the real world, something that we've seen and shot. It must be a characterizing element of the picture, but doesn't need to be the only subject of it. If you want, please add some comments/explanations to the picture.
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Stacks
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Smoke stacks pouring out from Nova Scotia Power in Halifax, Canada.
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Submitted: Thursday, 28th January, 2010 13:22 (GMT)
Taken: Thursday, 21st January, 2010
Focal length: 85 mm
Shutter speed: 1/320 sec
Aperture: F8
ISO: 200
Notes:
Views: 281
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