The bottom figures are constructed by tracing various parts in a plastic template called a Geometer (c). It's a great device for students who don't initially have much free-hand drawing ability. By following instructions, they can get a grasp of visualizing 3-D objects, then graduate to drawing them free-hand, like in the top illustration. Then, we can graduate eventually to drawing from nature because we see the underlying geometry. Examples in the next post.
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