Golden ratio

Represented by the Greek letter Phi, the golden number is 1.6180... This has fascinated the ancient Greeks, Renaissance artists, 17th century astronomer and a 21st century novelist. since 2003 the quest to know Phi was brought into the mainstream culture with the release of "The Da Vinvi Code" by Dan Brown.

This number is commonly used in the golden rectangle, most artists and architects believe this shape is visually pleasing and beautiful. This is why many buildings and artworks contain the ratio, such as the Parthenon in Greece, but its not known if it was designed like this on purpose.

The Golden ratio is found in nature, plants and animals have a composition that can linked to the golden number. This is why many people think it looks so beautiful.

Company logos also incorporate this so their brand feels appealing to customers, a good example is the Toyota logo.

I found a good article on this here: http://www.goldennumber.net/golden-ratio/
https://www.mathsisfun.com/numbers/golden-ratio.html