Sketch ~ this can be defined as a draft or rough outline of an idea,
it can be a means of depicting a three-dimensional form in a
two-dimensional guise. Sketches can be produced free-hand or using
rules and set squares to give basic guide lines.All sketches should be clear, show all the necessary detail and
above all be in the correct proportions.Sketches can be drawn by observing a solid object or they can be
produced from conventional orthographic views but in all cases
can usually be successfully drawn by starting with an outline `box'
format giving length, width and height proportions and then
building up the sketch within the outline box.Drawings---Sketches