Sketch - choose a jigsaw puzzle to solve

A sketch (ultimately from Greek σχέδιος – schedios, "done extempore") is a rapidly executed freehand drawing that is not usually intended as a finished work. A sketch may serve a number of purposes: it might record something that the artist sees, it might record or develop an idea for later use or it might be used as a quick way of graphically demonstrating an image , idea or principle. Sketches can be made in any drawing medium. The term is most often applied to graphic work executed in a dry medium such as silverpoint, graphite, pencil , charcoal or pastel . But it may also apply to drawings executed in pen and ink , ballpoint pen , water colour and oil paint . The latter two are generally referred to as " water colour sketches" and " oil sketches". A sculptor might model three-dimensional sketches in clay , plasticine or wax .