The Fibonacci sequence is a sequence where each number is the sum of the two preceding numbers. This sequence appears frequently in nature, such as the spiral patterns of shells, flowers, pine cones, and galaxies. The golden ratio is the number approximately equal to 1.6180 that results from dividing any number in the Fibonacci sequence by its predecessor. Both the Fibonacci sequence and golden ratio are found in architecture, like the Parthenon, as well as in music scales.