Phi, the Greek symbol for the number 1.618...

Phi
The Golden Number

1.61803398874989...

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Phi in Circles
Phi in Triangles
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Orthogons


The Golden Section is an Orthogon called the Auron.

The golden section can be constructed from a square with a compass and ruler:

Geometric construction of the golden section

This is the most commonly known of twelve orthogons which can be constructed using this technique.  Among orthogons, the golden section is known as the auron, coming from the root "aur," meaning gold.

Orthogons provide a system of design that for centuries has allowed artists and artisans to create consistent, harmonious themes without the need for complicated calculations or measuring devices.  Examples of orthogons include:

Orthogons - the auron

Orthogons - the diagon

Orthogons - the quadrigon

Orthogons - the hemidiagon

Auron
(Golden Section)
Diagon Quadriagon Hemidiagon
1/2 + √5/2
=1.618 ... = Phi
√2
=1.414...
1/2 + √2/2
=1.207...
√5/2
=1.118...
Height to width ratio

Insights on orthogons provided by Valrie Jensen.  See additional information on the application of orthogons to the principles of design at her site,  Timeless by Design.
 

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- Phi - The Golden Number - Ø
Your source to some of the Net's "phinest" information on the
Golden Section / Mean / Proportion / Ratio / Number,
Divine Proportion, Fibonacci Series and Phi ( 1.618 0339 887... )

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