Rituals I miss because of COVID: buying a fresh box of red grading pens at the start of each semester.
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Different colors for different uses. I use black ink for normal writing, annotate my lecture notes (which I type and print first) and writing in blue, markup my writing and grade in red.
Amusingly, my scripts for conference presentations and talks will have a bit of everything - the typed text, Q&A notes (to be ready for questions) in the margins in black, stresses and pauses in blue, last minute corrections and changes in red.