The Fibonacci sequence was discovered in the 13th century by mathematician Leonardo Fibonacci (Pisano Bogollo). The sequence is as follows: 0,1,1,2,3,5,8,13,21,34,55,89,144,233 and so on. In this sequence, each number (after the first 1) is the sum of the two numbers before it. The interesting characteristic of this sequence is that dividing any number by the following number approximates the ratio 0.618. Dividing any number by the number two places above it (e.g. 5/13) approximates a ratio of 0.382. The larger the numbers, the nearer the approximate value draws to the values 0.382 and 0.618. Other approximate ratios from dividing other numbers are 0.236; 0.5; 0.764; 1.382; 1.618 etc.