This lithograph print of The Scream (Edvard Munch, 1895) is entirely made using actual lines. Contour lines show the figure and its expression as well as outlining the bridge, the land, water and sky.

Lines are ubiquitous in the natural and man-made environments. Look out your window, which itself is an arrangement of lines creating shape, you will likely see the wires of GPL and GTT. These are ...