There are three things needed for a sundial. First, you need the SUN. Then you need the thing that will cast a shadow, the gnomen. Then, you need a surface upon which the shadow will be cast and measured.
Most sundials have a fixed thing which casts the shadow. However, an interactive sundial uses the human body as the shadow-casting element. One stands on a certain spot on the sundial, and one's shadow falls on the number indicating the time of day.
Interactive sundials are a fun teaching tool for kids. There are interactive sundials at the Chidren's Museum of Santa Fe http://www.santafechildrensmuseum.org/index.html and at the Brooklyn Childrens' Museum. http://www.robertadzema.com/Public-Commisions/Brooklyn-Children%27s-Museum.jpg.php
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