Geometric shapes in our life

Challenge #6 in the Places I have seen, people I have met series. Hosted by paradiso.
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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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Algebuckina Bridge, South Australian outback
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An old rail bridge at Algebuckina in the South Australian outback.
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Submitted: Friday, 29th January, 2010 11:55 (GMT)
Taken: Friday, 14th August, 2009
Focal length: 18 mm
Shutter speed: 1/125 sec
Aperture: F7.1
ISO: 100
Notes: Slight cropping and converted to B&W
Views: 199
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