Circles in Nature

Challenge #46 in the Life in the Natural World series. Hosted by RuthC.
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In this challenge, show us circles formed by nature. This might be a flower, a mushroom, a leaf, or perhaps something formed by wind or water. Macro and close-up shots welcome. Subjects should be taken outside in their natural environment, not inside under studio lights. No balls or spheres, or spirals this time; they will have their own challenges later. No shots of the moon, (which is a sphere.) SIZE: 1,600px MAXIMUM ON LONGER SIDE.
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Bubble bubble toil & trouble
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Circular patterns left by burst bubbles of boiling mud at Whakawerawera Thermal Park, Rotorua, New Zealand.
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Submitted: Tuesday, 14th May, 2013 06:32 (GMT)
Taken: Saturday, 30th September, 2006
Focal length: 71 mm
Shutter speed: 1/640 sec
Aperture: F4
ISO: 100
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