Around 1200, Italian mathematician Leonardo Fibonacci discovered a sequence of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, etc.

The following number is calculated by adding the two numbers before it. This became known as the Fibonnacci Sequence, and it has a direct relationship with the Golden Ratio. When you take any two numbers next to each other in this sequence, their ratio is very close to the Golden Ratio. The higher the number, the closer to the Golden Ratio. For example, the ratio 13 to 21 is 1.625 -- very close to the Golden Ratio's 1.618. No matter how high you go through the Fibonnacci Sequence, this will stay true.