Geometric Shapes in Nature

Challenge #184 in the Life in the Natural World series. Hosted by RuthC.
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In this challenge, show us examples of the interesting geometric shapes found naturally in our environment. I know that everything has its own shape, but I'd like to see images where the geometric shape is the dominant subject, such as triangles, squares, circles, spheres, etc. No man-made geometric shapes please. Macro and close-ups welcome. Size of entry: 1,600 pixels on the longer side. For more information, read: https://en.wikipedia.org/wiki/Geometric_shape
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stabbing triangles
Fern
Nautilus Shell
By the skin of its teeth
Bee's Nest
alveolus
Round artichoke with triangular petals
Bubbles under ice
daisy
Beautiful eyes.
Flower
Irregular Polygons
complexity 2
Snow White Mushroom
Circles
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Sample entries
These entries were provided by the challenge host(s) as samples and cannot be voted on.
Spheres, Lots of Them
Triangles, Rectangles, and Polygons
1,600px MAXIMUM
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