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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Triangle Rock Pools
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Submitted: Saturday, 19th October, 2013 03:23 (GMT)
Taken: Sunday, 30th May, 2010
Focal length: 14 mm
Shutter speed: 1/125 sec
Aperture: F6.3
ISO: 100
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