I began to doodle something one day - I had no clear idea of what I wanted to draw; I was just putting lines on the page. One bird emerged, then another. I didn't used to work spontaneously - I used to sit down with a project in mind and work out a study in pencil then when I was satisfied with that I would begin to add ink and acrylic and work for hours and hours. I like to work this way too. Sometimes it's good to fill a page and then sift through it afterwards - sometimes there's a nice surprise when you're finished - a little character who's been evading you so far has just turned up out of the blue. One of those "oh, there you are!" moments.
Here's a short stop motion film by Charley Bowers from 1930.