State of Flow

I just emerged from however long it took me to write about four pages of reasonably-mathematical LaTeX text (about four hours, I think) to finally notice that I had been listening to the first Goldberg variation the whole time (where my intent had been the milder repeat-them-all mode). As I twitch rhythmically I wonder whether I have rediscovered technology from the brainworld in A Wrinkle in Time (M. L'Engle, RIP).