We should avoid the tendency to make the art just about looking up theories and correspondences and then repeating that set of ideas on rote, like punching numbers into a machine.
Well said, Alucard, aka deus ex machina!
Formal Color Theory is a great metaphor for theurgy, and how ceremony can better be seen an a progressive journey of exploration.
As a professional artist and art director (video games and film), early in my training I studied Color Theory on my own and in college, learning the names of pigments in Winsor & Newton oil paints, and paying close attention. Color Theory gave me conceptual framework to hang and organize my own explorations on, while it also expanded my ability to see colors and use them.
So later, over the years and now, when I take the Pantone Color Vision Test, I get a perfect 100 color vision score because I can detect minute gradations of, say, greens or blues. Learning and Ceremony are interrelated and are both psychoactive. They change what we expect to see, and so we do. So pick something that has stood the test of time, and not a framework that range-limits your own explorations.
Our brain needs a framework to notice data and then remember it. Data without a framework (the so-called and often derided 'scaffolding' here) gets forgotten, so it's as if you never even learned it in the first place. In psychology these frameworks are called Schemas. A schema is a cognitive structure that helps us organize and interpret information. Having theurgic maps from others who have travel that road before us helps tremendously, if we take them as a guide.