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Wikipedia: Spirals – Spirals and helices, 2D spirals, 3D spirals, In nature, As a symbol, and In art.
Mathematische Basteleien: Spirals – What is a spiral? and types of spiral.
Wolfram MathWorld: Logarithmic Spirals – Equation offered.
Phi: 1.618: The Golden Number: Spirals and the Golden Ration – Article: Fibonacci numbers and Phi are related to spiral growth in nature.
Discover Magazine: Article: Why Is Our Universe Filled With Spirals?
Original Beauty: Spirals In Nature – Site offers a photo gallery of spirals found in nature.
15 Uncanny Examples of the Golden Ration in Nature – Site offers pictures and information about spirals and the Golden Ratio.
Fibonacci in Nature – Site talks about Nature’s Numbering system and offers picture examples.
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