I used to bring my sketchbook to gym class and doodle, because I am a very uncoordinated athlete.
How many of you are creative? I don't know, but for me, when you make a bunch of things over time and then you keep them... you forget. I look through my sketchbooks and I'm an audience for myself.
The sketch hunter moves through life as he finds it, not passing negligently the things he loves, but stopping to know them, and to note them down in the shorthand of his sketchbook.
Mostly, drawings are things I make for myself - I do them in sketchbooks. They are mental experiments - private inner thoughts when I'm not sure what will come out.
My sketchbook is a witness of what I am experiencing, scribbling things whenever they happen.