A method of drawing the darkness

Sit in a dark room. Not totally dark, you should be able to see the paper and where on the paper you have the pencil. But thats enough light. Now you sort of make lines for the things you see. If you see something like a shadow, make a lot of lines there or use thicker pencil. And everywhere you see something you just draw that on the paper. Thats drawing in the darkness, a method of drawing the darkness.