God love Golden ratio

  Let’s see a normal formula first:

  This little formula lead to the Golden ratio:

  Illustration:

  The Golden ratio is much more than a ratio(At least it's golden ^-^). The ration somehow fits the concept of beauty of human. It has been used almost all over the world.
  Look at the five-pointed star, each point near the middle is the Golden ratio point of the line it belongs to.

  Further more,The 16th-century philosopher Heinrich Agrippa drew a man over a pentagram inside a circle, implying a relationship to the golden ratio.

This is regard as the most beautiful ratio of human

  The artist found when the ratio of length of leg to the stature the people looks most beautiful, actually many famous statues follow this principle.

  Most legs are short than the Golden ratio, that may be why women likes wearing 

high-heeled shoes, and dancer always lift their heels when dancing to reach the Golden ratio.
  In nature,Adolf Zeising found the golden ratio expressed in the arrangement of branches along the stems of plants and of veins in leaves. He extended his research to the skeletons of animals and the branchings of their veins and nerves, to the proportions of chemical compounds and the geometry of crystals...

  And there are so many applications of the Golden ratio, if you want you can find these application everywhere.

References: http://en.wikipedia.org/wiki/Golden_ratio
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