Triangles, Squares & Rectangles in Nature

Challenge #69 in the Life in the Natural World series. Hosted by RuthC.
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This may be an interesting challenge for you to find examples of sharp angles in nature, where curves and smooth lines are the norm. The triangles, squares, diamonds, rectangles rhomboids, polygons etc should be outside in the natural environment. Macro and close-up shots welcome. SIZE: 1,600px MAXIMUM ON LONGER SIDE.
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Basalt columns creates spectacular patterns downstream Aldeyarfoss in northern Iceland. The columns erode due to penetrating water and frost, causing fragments and even whole columns to slip off the wall. As for the title, ehrrmm - no comments! :)
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Submitted: Friday, 25th October, 2013 07:19 (GMT)
Taken: Sunday, 5th July, 2009
Focal length: 50 mm
Shutter speed: 1/80 sec
Aperture: F6.3
ISO: 100
Notes: Tripod
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