I write in the margins of my books – generally notes to cross-reference to other dots of information.
I love when I buy a second-hand book to read the notes or inscriptions of others. It is a bit similar to the mantra that we are only custodians of our houses/buildings and are holding them for the next generation. I like to read what the previous generation might have added to the book.
I am a fan of Bookcrossing and very much appreciate public realm works so I was very well impressed with Liverpool One for their book swap chill zone.