I like to use a loose line. I've heard it called "travelling lines" which are lines drawn as a sort of searching for the right line. This type of drawing is also used in prelimary stages for working out composition and design. I like drawing like this as preliminary searching and for their own right. It's got a lot of vitality and personality. Giacometti comes to mind. I think also, there is a heavy influence from the look of wire frames used in computer graphics. 5.5'' x 8.5''.