Imagine a new colour... What would this colour look like? There is no such thing as new colours right? WRONG!

In order to understand this, we must understand what a colour actually is. Well that's pretty simple, we see light with different wavelengths as different colours, meaning each colour and each shade of each colour has a specific wavelength. Next we must understand how we see. we see using things called cone cells. Each type of cone cell can detect a different wavelength of light (colour) and sends a signal to our brain telling us that the colour is present. Humans possess 3 different kinds of cone cells meaning that we can mix the three (blue green and red) to make all the different colours we see. However not all animals have 3 types of cone cells. For examples bulls only have 2 types and dogs only have 1 type which is why we say that dogs are colour blind. Well what does all this have to do with a new colour? Well, an animal possessing 4 types of cone cells could see 16 more colours than you and i can not. What blew my mind even more is the fact that some rare human beings also possess 4 types of cone cells. The condition is called  Tetrachromacy (linked to wiki) and it means that people can really see new colours.