A fun fact from Crayola:

In 1990, after 37 years of service, the most senior Crayola crayon maker, Emerson Moser, retired after molding a record 1.4 billion crayons. It was not until his retirement that he revealed a very well-kept secret – he was actually colorblind.

Let’s make a painting. Green grass, blue sky and a bright sun. So let’s take the green crayon for the grass. But how do I know which one is the green crayon? I have this problem all the time. Either I know the color of my crayons or pencils I have with me otherwise I have to guess. Every time, really every time. If you own your box of crayons you just know the colors by heart. You learned them once and remember which one is which color. I think this is very strange for somebody who can see colors. Color blindness is about learning colors like foreign words. And after a while you forget it or it shows up in a different shade and you have to learn again. Learning colors.