O.K., I am a writer, artist (both 2-D and 3-D, but primarily a carver), and (was) a scientist. 'Though I no longer do research, all my degrees are in science - including Ph.D.
I have taken enough art studio and history courses for a BFA, but never got one. Only studied writing through a smattering of workshops and continuing ed courses. Most of what I know about it I learned through doing, i.e., writing and reading, participating in strong writers' critique groups, and teaching undergrads. It is amazing how one's own writing improves after grading others' work.
Interestingly, I found that creation in ALL media (including science theory) felt the same... Maybe because I was an "exploratory scientist" using exploratory statistics (not the hypothesis testing stuff you may have met in a basics course).
Science theory creation felt like tracking an elusive beast thru a dense jungle - trying desperately to record my tracks. The end result, the theory, was not so much the beast but a map of the way to find the beast - a discovery of the innate order of the jungle - which emerged through a kind of shearing away or seeing through the tangles to the core meaning/underlying structure.
As a carver (especially of wood where the grain rules), I do something very similar - or it feels similar. I draw plans, choose wood that seems to support my plans - and since I do furniture I have to be really anal in meeting rigid engineering constraints in my plans. But then I start carving. The grain & inherent, energetic structure in the wood takes control as I listen to what it is saying and help that inherent structure emerge.
Creative writing feels much the same.
In all three arenas (creative writing, visual art and scientific theory generation), that unitive state where my separate, rational, little 's' self disappears into a flow of creative inspiration feels exactly identical. Like catching and riding a huge wave (in comparison to which my conscious self is a tiny speck). All I have to do is keep my puny ideas, ego and fears out of the way and let 'er rip.