Fibonacci poetry is based upon a mathematical sequence popularized by Leonardo Fibonacci, a 12th century mathematician. A Fibonacci sequence begins with 0 and 1. Each succeeding number is the sum of the previous two numbers.
The first 13 numbers in a Fibonacci sequence are 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, and 144. In a Fibonacci poem, the zero is dropped, and usually only the first six or seven numbers following the 0 are used. This is a 7-line Fibonacci.