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229 How Rules Work When I Calculate<br />

A fi B<br />

An arrow ( fi ) separates the two shapes. The rule has a left side that contains A and a<br />

right side that contains B. IfA and B are drawn, then registration marks are used to fix<br />

the spatial relation between them. The rule<br />

for example, turns a square about its center and shrinks it. The rule is a particular instance<br />

of the schema<br />

x fi tðxÞ<br />

I used in part I. The spatial relation between the squares in the rule—more accurately,<br />

their sum—is explicit when the mark<br />

in the left side of the rule and the one in its right side register<br />

This is a convenient device to show how different shapes line up. Likewise, the rule<br />

is one instance among many of the schema<br />

bðxÞ fi x<br />

when bðxÞ is eight points. The shapes in the left and right sides of the rule line up just<br />

so

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