" ...] They will of course mention stove-lids, dinner-plates, etc., as round objects, and the attempt to give a clear and definite understanding of the difference between solids and planes is difficult at first, but they very soon discriminate between rounding objects that possess thickness and those that are flat but have curved edges. A ball of putty or one of dough is a good thing with which to illustrate this difference. We must remember that any abstract teaching on Form is too difficult at this time, much more difficult than Color. Let the children, during these first few weeks, draw circles on the blackboard and on paper, and sew, and draw pictures of balls, peaches, or round fruits; they may also ...]."
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