Statues (with bench between them in case you can't tell!) from The Virginia Museum of Fine Arts, as "blind contour" drawings.
More "blind contours" to be found at "Inkfinger
", go see!
Also, recently discovered the work of illustrator Rachel Ann Lindsay
, an artist whose work is similar in style to blind contours, thought I'd add her link to show how someone has adapted this method of drawing for professional work. Found via "Illustration Mundo"