One of the Kepler-Poinsot Solids whose Dual Polyhedron is the Great Dodecahedron. Its Schläfli Symbol is . It is also Uniform Polyhedron and has Wythoff Symbol . It was originally called the Urchin by Kepler. It is composed of 12 Pentagrammic faces. Its faces are . The easiest way to construct it is to build twelve pentagonal Pyramids

and attach them to the faces of a Dodecahedron. The Circumradius of the
small stellated dodecahedron with is

**References**

Fischer, G. (Ed.). Plate 103 in *Mathematische Modelle/Mathematical Models, Bildband/Photograph Volume.*
Braunschweig, Germany: Vieweg, p. 102, 1986.

Rawles, B. *Sacred Geometry Design Sourcebook: Universal Dimensional Patterns.* Nevada City, CA: Elysian Pub., p. 219, 1997.

© 1996-9

1999-05-26