One day, on impulse, I asked the students to copy a Picasso drawing upside down. That small experiment, more than anything else I had tried, showed that something very different is going on during the act of drawing. To my surprise, and to the students’ surprise, the finished drawings were so extremely well done that I asked the class, “How come you can draw upside down when you can’t draw right-side up?” The students responded, “Upside down, we didn’t know what we were drawing.” This was the greatest puzzlement of all and left me simply baffled.
Betty Edwards, Drawing on the Right Side of the Brain