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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The Portal
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Window opening of a rusting shipwreck in Jordan Station, Ontario.
Camera:
Lens:
Submitted: Tuesday, 26th January, 2010 11:05 (GMT)
Taken: Saturday, 16th January, 2010
Focal length: 9.64 mm
Shutter speed: 1/40 sec
Aperture: F2.8
ISO: 80
Notes:
Views: 208
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