The epitome to me of “Writing as Meditation” is the medieval scribe in a scriptorium. The focus on every word, the exact and careful tracing of each letter, is writing on a spiritual plane.
But a focus of that intensity also needs a break. One form must have been the complaints and comments some scribes and copyists put in the margins. Here is one: “New parchment, bad ink; I say nothing more.” The creation of whimsical marginalia was another, with animals as knights, fantastic monsters, and not-so-subtle sexual poses and sarcasm.
The Getty Museum produced a very interesting video on the making of parchment, the materials scribes used for writing and illumination.