Fibonacci Numbers In Nature 12" x 18" Poster

0, 1, 1, 2, 3, 5, 8, 13, 21, 34...

After the first two 1’s in the sequence, each subsequent number is equal to the sum of the previous two numbers. The sequence is named after Leonardo of Pisa, known as Fibonacci. Although he was not the first to describe the sequence, he did publish it in his book Liber Abaci, which introduced Hindu-Arabic numerals to the West. These intriguing numbers can be found in the branching of trees, the patterns on a pineapple, the florets of a sunflower, the spirals of a pine cone, and the placement of leaves on the stems of many plants. Fibonacci numbers are one example of the patterns that mathematicians search for. Perhaps you can find examples of Fibonacci numbers—or other patterns—in the world around you.

Fun fact: November 23 of each year is celebrated as Fibonacci Day, because when the date is written in the mm/dd format (11/23), the digits in the date form a Fibonacci sequence: 1,1,2,3.