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189 <strong>Shape</strong>s in Algebras and Algebras in Rows<br />

contains no maximal plane that’s a maximal plane in the shape<br />

Nonetheless, their difference—the second shape subtracted from the first shape—<br />

contains none of the planes in the first. This part<br />

of the first shape is produced instead. It results when the part<br />

that the two shapes have in common is taken away. A nice way to confirm this is to<br />

draw both shapes together—to form their sum<br />

and then to erase the second shape

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