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254 II Seeing How It Works<br />

Or I can opt for a rule with symmetry<br />

so that things stay the same when I calculate<br />

But this rule and two others<br />

work together to produce tessellations like this<br />

There’s no telling when another rule might be useful—and it’s always possible to add<br />

rules to the ones I’ve got.<br />

When I started talking about the schema<br />

x fi A þ B<br />

and its inverse, I said that what’s changed needn’t be what’s added. For example, I can<br />

modify this rule

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