There is one thing that ancient Greeks, Renaissance artists, a 17th century astronomer and 21st century architects all have in common – they all used the Golden Mean, otherwise known as the Golden Ratio, Divine Proportion, or Golden Section. Precisely, this is the number 1.61803399, represented by the Greek letter Phi, and considered truly unique in its mathematical properties, prevalence throughout nature, and its ability to achieve a perfect aesthetic composition. According to astrophysicist Mario Livio in his book ‘The Golden Ratio: The Story of PHI, the World's Most Astonishing Number’: Some of the greatest mathematical minds of all ages, from Pythagoras and Euclid in ancient Greece, through the medieval Italian mathematician Leonardo of Pisa and the Renaissance astronomer Johannes
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