Get the picture?
Any questions? This 1981 British outdoor board makes a very simple and effective demonstration in a very confined space. In fact, that limited amount of room actually gives the visual extra stopping power; the doubling over of the pencil is an attention getter and adds extra emphasis on how long the pencil would need to be to contain the same amount of lead. A great example of how working within limitations doesn't have to inhibit creativity or communication.
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