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Leonardo Da Vinci
November 23 (11/23) is Fibonacci Day, a special day in honour of the European mathematician who introduced the numerical sequence that manifests itself throughout nature.
Leonardo Bonacci, known as Fibonacci, and Leonardo of Pisa, was an Italian mathematician, considered to be "the most talented Western mathematician of the Middle Ages". He is credited with introducing the "Hindu–Arabic' numeral system to the Western World primarily through his composition in 1202 of Liber Abaci (Book of Calculations). Also, He introduced Europe to the Fibonacci sequence, which turns out to be the key to understanding how nature designs... and is... a part of the same ubiquitous music of the spheres that builds harmony into atoms, molecules, crystals, shells, suns and galaxies and makes the Universe sing.” Guy Murchie “Because our world is constructed from geometric relations like the Golden Ratio or the Fibonacci Series, by thinking about geometry all the time, you could organise and harmonise your life with the structure of the world.” - Einar Thorsteinn
In those days scientists used the observation of nature to find answers. Fibonacci’s spiral can be easily spotted on pine cones, seashells, sunflowers, flower petals and countless other life forms. He used the example of a rabbit population to explain the sequence. In the sequence, each number is equal to the sum of the previous two numbers. ie 1, 1, 2, 3, 5, 8, 13, 21, ...and the ratio of any two successive numbers is nearly equal to the golden ratio. The Golden Ratio (also called the “divine proportion”) is regarded as a universal standard of beauty and is found throughout nature, art and architecture.
His contributions brought meaning, beauty and understanding to our world. If you wish to see more examples of the sequence look here