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Drawn freehand with a ball-point pen. Yep, believe it or not. It’s a technique, whereby I create a line slowly, adding to the length one piece at a time, and going back and forth over the end of the exitsing line to straighten it out. The color you see here is a poor match to the actual drawing, but the best my scanner was capable of.

There are two categories of ball-point pens: those which can be used to create variable shading (those common Bic “round stick” pens, or most of the common Papermate pens I’ve encountered) and those which create solid blocks of ink, or fills, easily. This image demonstrates the latter category.