Closely Spaced Parallel Lines

Hatching, using parallel lines to represent tones or shading, originated in Western art in the Middle Ages, and by the 15th Century had further developed into cross-hatching, using sets of parallel lines placed at an angle to one another. Artist and Illustrator, Albrecht Dürer (1471-1528), is recognized as perhaps the greatest master of the technique.  And if you're wondering why I'm telling you this, it's because I couldn't think of anything else to go with this sketch....so, art history lesson.