How many of us write notes in our books? Are you a Footprint Leaver or a Preservationist?
I'm a sticky-noter. I cannot bear to read the inanities I thought when I read the book before. So, when I'm in the midst of it I am a copious user of Post-It flags. Then I reread what I flagged. Then I take them off and shelve the book.
Smock is a footprint leaver, though, I think.