Underground train drawing

In which a Northern Line train on London's Underground collaborates with the artist on 4 Dec 2003 to make some drawings.

• Tufnell Park to Kentish Town and Kentish Town to Camden Town. The train is conveying the artist in a sitting position, and the direction of travel is to the left.
• Camden Town to Kentish Town and Kentish Town to Tufnell Park. The train is conveying the artist in a standing position, resulting in a looser line, and the direction of travel is to the right.

Update, 5 Jan 04: We now have another 50 or so of these drawings. Soon. (What might they be used for?)