I like blue because  is one of the three primary colours of pigments in painting and traditional color theory also it's very soft and friendly to the eye
Blue is my favourite colour! Van Gogh used much of it in some of my favourite paintings.
Do you know that blue can be found netween violet and green on the spectrum of visible light.
I've never heard that before. Thanks for sharing that information. 
The eye actually sees blue when you are observing white light anytime the wavelength is  between 450 and 495 nm
That's crazy, our bodies are amazing things, aren't they? Who made that discovery?
Well, thanks to research we know all the amazing discoveries. Blue is a mix actually,violet and green on the spectrum of visible light.   
I didn't know it was a mix, I thought it was a primary colour. Thanks for sharing and educating on the topic.