[The best way I can think of revisiting the past is to look through my old sketchbooks, so this image came immediately to mind.]
My sketchbooks are a source of comfort and pleasure. Whenever I feel bored or unsure about a situation, or when I plain don't feel like being sociable, I know that, in my purse, a world of escape awaits. They are my memory of events I enjoyed, my record of places visited, my outlet for what can't always quite be said in words.
