
Just one. That’s it.
Chan Hwee Chong made this and other single line drawings, all in spirals, for a Faber Castell ad campaign. At the link, you can watch a video showing how he does it. It’s amazing.

This drawing by Napoleón Vuelaenpartes is composed of a just one line, from the helmet of one Stormtrooper to the next. Imperial Breakfast sets just the right mood. “How’s the new baby, Sam?” “Not bad, Ralph, almost sleeping through the night now.”

Maybe my Google-fu isn’t as strong as yours, so I’ve just found out that you can find nifty things like line drawings, faces, and clip arts in Google Images!
Here’s what you’ll find if you look for line drawings of "Neatorama": Link – via Chris Glass

