Marginalia, making notes on the margin of a book. Marginalia is the practice of making notes on the margin of the book which supposes a kind of interaction between the author’s ideas and yours. In my opinion this is an interesting idea even though I don’t use it, and in order to have a good opinion on the topic, it would be important for me to previously experience it. The reason why I have never try this is because I like to keep my books clean and nice, so maybe for me the ebook option would work a lot better because I just would see the marginalia when I want to and hide it when I want to see a nice, clean book. The most appealing feature of marginalia to me is the option of sharing your thoughts or to be able to see other people ideas, so you can debate or enrich your own thoughts about a book. From my point of view, I this would be a lot more useful with book containing deep ideas because for me these are really good to learn something new and also can give you a greater experience or a new interesting point of view of the topic that can make an impact on your life. Definitely, I consider this to be a valuable practice that I would like to try to see how it feels.