The color blue is among some of the last colors ever mentioned in the recordings of human history. In "The Odyssey," the Greek poet Homer never used the word blue and famously described a 'wine-dark sea.' Black is mentioned nearly 200 times; white about 100; red is mentioned 15 times and yellow and green are described 10 times. Blue also doesn't appear in the Koran, ancient Chinese stories, and an ancient Hebrew version of the Bible. Despite the blue sky above us and the blue waters around us, the word wasn't used until the Egyptians, who were the only culture that could produce blue dyes. They were also the first ancient civilization to have a word for the color. Yet, in a recent study in 10 countries across four continents "blue" is named as the most popular. It fascinates me that a color which was unknown to us - and some even say unseen by us for so long in our history is now universally regarded as calming, trustworthy and a color which denotes happiness. In my Blue Series, I explored the many ways in which the color enters our minds and souls.