Thinking and pens
Peter regularly said, when I was a kid, that he couldn’t think without a pen in his hand. (I think I know the feeling–if I don’t have a computer keyboard or a pen or some other means of transcribing thoughts in front of me, it’s easy for my thoughts to get stuck running around in circles.)
Somehow that comment of his got conflated in my head with his habit of doing crossword puzzles in pen. Sometimes he would make mistakes, but he would just cross them out or overwrite them.
And that leads me to his habit of correcting typos (in pen) in printed books, but I’ll talk about that in another entry.