Most people associate drawing with preparatory activity. But from the dawn of printing and platemaking, drawing has also served a production purpose. And drawing for reproduction–from woodcuts to comic strips–has traditionally involved the use of a key drawing, typically printed in black. The key drawing provides the linear architecture, or a kind of skeleton for the image.
Think of these two images (top, an Osamu Tezuka panel from Astro Boy; above, the title page illustration for Guess Who! by Eileen Fox Vaughn, a Whitman Publishing coloring book) as gateway drugs for drawing geeks. An extended reflection on key drawings and visual approaches to same may be found here. Enjoy.