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239 Trying It Out<br />

In fact, my rule for dihedral symmetry gives like results. Symmetry—now of shapes<br />

in rules—can’t be ignored. And again, it’s something to use. But I can also go on and<br />

calculate with my rule for squares to produce other shapes<br />

—this time, so that there’s no way of applying its inverse to get back to the start. If I try<br />

to calculate in reverse, it’s<br />

Every small square contains sides of two others. And when the rule is upside down, it’s<br />

If I don’t like these additional possibilities, I can avoid them. I can incorporate points<br />

in my rule<br />

to get only a frieze<br />

And the inverse of my new rule undoes what I’ve done without a hitch, even if it is<br />

symmetric. Squares keep their semantics.<br />

It isn’t hard to modify the rule

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