I loved doing this in art class. Art With Mr. E: Line Design w/Shading - Grade Very cool, fun art shading project from Art With Mr. E. he's an elementary art specialist. Try this with your kids (but I think grown ups would enjoy this too).
Line- a mark or stroke long in proportion to its breath. Often it defines a space and may create an outline or a couture, define a silhouette, create patterns, or movement, and the illusion of mass and volume
Projection of a line drawing Line drawings by Sky Kim: endless, voluptuous, billowing form. :: lovely, i can't wait to draw something like this and i would install it exactly like this, part of it being on the floor!