In this art tutorial, I explain how to use your pencil as a ruler to measure whatever you are looking at and compare that worth other sections of the all life. To do this you must have your arm straight, one eye closed and the ability to move your thumb up and down the pencil. The way it works is simple, if a section of the drawing is twice as long as another section, you know the same has to apply in your drawing. Using these measurements it is possible to create a very accurate drawing of whatever you see. In this case I use a still life as the starting point, but it could be a landscape or even a person.