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On Marginalia
A note on writing in the margins of a book, and why it beats a separate notebook.
I used to keep a separate notebook for reading notes, and it never worked, because a note taken three pages after the sentence that prompted it is already a note about something else. The margin is the only place close enough to the thought to catch it before it changes shape.
Why the margin works
A margin note has no room to perform. There is space for a word, an arrow, a question mark — not a paragraph, and that constraint is the whole point. You are not writing an essay in the gutter, you are leaving a trail for the person rereading the book later, who is usually you.
Pencil, not pen
Pencil lets the note be provisional. A pen commits you to an opinion you may not hold by the next chapter; graphite just sits there, easy to disown.
Why it beats a separate notebook
A notebook note has already lost its context by the time you write it. The margin note keeps the sentence and the reaction on the same page, permanently, so rereading the book later means rereading your own reactions to it as well — a second, quieter book layered on top of the first.