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240 II Seeing How It Works<br />

with points and labels in many other ways. I can use multiple versions of it—perhaps<br />

with additional rules—to produce shapes with myriad kinds of properties that may be<br />

desirable. Try it for shapes like the ones in the series<br />

or in the series<br />

Or simply change the rule—again with points and labels—and see what you get. This<br />

is a good way to find the tricks that make rules do what you want. And it’s always possible<br />

to be surprised—shapes are filled with ambiguities. Using them makes calculating<br />

worthwhile.<br />

A variation of the schema<br />

x fi x þ tðxÞ<br />

shows how shapes and their boundaries go together in spatial relations. In particular,<br />

the rule<br />

and the rule<br />

are both instances of the schema

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