Technicolour Tube Map

Which is what it reminds me of. Of course it isn't - and the title I have for it officially doesn't make any sense to me - so Tube Map it will have to remain - for now.
My artists' network have begun a project with Durham Universty's Biomedical department. To see if artists can bring something to their research basically.
They've given us some of the images from what I think are scanning electron microscopes to look at.
Thought I might see what pastel will make of this one.
Nothing ventured... etc