Golden ratio [read everything]

Challenge #11 in the Symbols series. Hosted by nDray.
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Learn about the golden ratio first: http://en.wikipedia.org/wiki/Golden_ratio Then show us! If it's mathematical formulae with the golden ratio, great! But it is also present in nature, so go after it!
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Fibonacci angle and patterns in Cactus and Succulents.
by dpas11
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360 degrees in a circle multiplied by 0.618 = 225.5 degrees ( 137.5 degrees left over) - the Fibonacci angle, this is the angle between each successive leaf etc on a plant. Fibonacci angle means that leaves above do not hide leaves below so ensuring maximum sunlight to all leaves, and rain is caught by the most leaves and channeled to the soil and hence roots. The plant in the picture depicts this in nature.
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Submitted: Wednesday, 13th July, 2011 22:53 (GMT)
Taken: Saturday, 25th June, 2011
Focal length: 70 mm
Shutter speed: 1/320 sec
Aperture: F2.8
ISO: 200
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Views: 210
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