Where my obsession with Ultramarine blue comes from

Getting ready to make new work, I tidy my studio space and clean the glass where I mix my paints. Some had stuck to the glass so I scraped them back. It did the trick - I liked the accidental effect it'd left behind… Maybe these could become paintings in their own right? Which led me on to thinking, "Why not?"
"Could they be big colourful works that don't have to say anything in particular"? "Does an artist's work have to have a back story all the time?" 

I started to work on an idea that I'd had for a long time but never carried it. I'd drawn it in a tiny sketch book then on my computer, then once the  painting got underway, it seemed to have a life of its own, wanting to take me into another direction instead. 

What should I do? Fight it? Stick to the original idea? I often come across questions in practice...

I tried sticking to my original idea, but whatever I did, it didn't seem to work. I don't even want to talk about it (maybe that's where I went wrong. Talked too much and jinxed it). It's of light and movement. It's completely ultramarine blue. About nothing in particular!

It could be underwater, weather, outer space or the night sky. I've noticed that people just like to stop and stare at it.

Last night I watched 'The History of Art in Three Colours,' (BBC4). Yves Klein (1928 - 1962) was featured. He devoted much of his short life (he died in his early 30s) to creating paintings just in blue. A particular paint that he developed with Edouard Adam, a Parisian art paint supplier.  International Klein Blue (IKB) was born! It's one thing to see them online and spectacular when seen in real life (at Tate Modern). It's like velvet, so rich and even 3-dimensional. Klein sought to break away from representing objects – he wanted to attain creative freedom, enabling the viewer to simply enjoy the pleasure of this tantalising shade of blue.

For me, it's, "The blue of a perfect sky, as day becomes evening." And with this, an obsession with the transparent qualities of Ultramarine paint. Oil, acrylic, watercolour...it's all beautiful, expansive, deep and mysterious. 

https://www.tate.org.uk/art/artworks/klein-ikb-79-t01513
http://www.bbc.co.uk/programmes/b01l9mf8/episodes/guide
BBCFour – A History of Art in Three Colours