Part 5 describes phi and its relation to the golden ratio and golden spiral. The video explains the formula for the golden ratio and where the ratio can be found in nature.
![Flowers laid out on a white piece of paper.](https://stg.pinnguaq.com/wp-content/uploads/2021/09/lucas-and-fibonacci-numbers-in-nature-300x165.jpg)
Part 5 describes phi and its relation to the golden ratio and golden spiral. The video explains the formula for the golden ratio and where the ratio can be found in nature.