The Fibonacci Sequence and Golden Ratio

Did you know that the parts of your body are all in the same ratio? It comes from the Fibonacci Sequence and is called the Golden Ratio and it is 1:1.6.
Year 9 had great fun proving it by measuring their arms and fingers and working out the ratios. They also drew pictures of the Fibonacci Spiral (Golden Spiral) which has the rectangles all in the same ratio and appears frequently in architecture and nature.