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You can write any number of Microsoft Visio formulas to control the appearance or position of a shape on a page, but there's more to shape behavior than geometry and location. A shape can provide information to users in the form of visual feedback, such as control handles with tool tips or custom commands on a shortcut menu. Moreover, users can associate information with a shape in the form of custom property data or layer assignments. These enhancements to shape behavior can make a shape better model the real-world object it represents.