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- Elements
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- The primary elements of form-
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- points, one-dimensional lines,
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- two-dimensional planes, and
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- three-dimensional volumes-can
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- be seen to exist in all spatial
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- environments.
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- As conceptual elements, the
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- point, line, plane, and volume
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- are not visible except to the
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- mind's eye, but we can sense
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- the presence of: