The story’s almost over! Just the denouement left now.
I was still using Illustrator when I drew The Catch of the Moon, so everything I was doing was using vectors. That means every line or effect had to be stored mathematically as equations and formulas, rather than as a bitmap like scalar images (as I now use in Photoshop).
Every time I drew that solar storm, my whole computer chugged to a near-standstill. There were a lot of particle brushes and thing involved in making it, and trying to render the whole thing each time was strenuous. I ended up rasterising (making into scalar graphics) it for easier editing whenever I drew it, which made it easier to edit once I’d gotten it right, too.