Dots in the Margin

When I come across something I really like in a book, I put a little dot in the margin. Not a check, not a double line—these would be pedantic—but a single, nearly invisible tap or nudge of the pen-tip that could almost be a dark flick in the paper.

I also write the numbers of the marked pages in the back. Then—and this is the most important part—at some later date, sometimes years later, I refer to the page numbers, locate the dots, and copy in a spiral-bound notebook the passages that have awaited my return.

From http://marksinthemargin.blogspot.com/2011/03/dots-in-margin.html