The scribble allows you to react and respond to the subject intuitively. You make decisions about composition before you have had time to think about composition. The scribble involves your whole body, not just your fingers.
So, tonight, working from one large still life, we drew like devils. Starting out with several one minute drawings, then 2 minutes drawings, then 5 minutes, and finally finishing the night with a 30 minute drawing. Here's a montage from the class.
Next week- Pain Air Perspective.