Zinnia Star, by Meenakshi Mukerji
I made this model as a gift for a friend of mine who is a teacher. After it was completed, it occurred to me that it would collapse under the weight of all the children in her classroom, so I did the forbidden and added some glue. It was quite sturdy afterwards!
The shape here is a great stellated dodecahedron. I thought that was odd at first, because I look at it and I see triangles. There are 20 triangular pyramids in the model. Dodecahedron = 12 pentagons, and icosahedron = 20 triangles. So why is it called a stellated dodecahedron rather than an icosahedron?
Wolfram Mathworld says:
Stellation is the process of constructing polyhedra by extending the facial planes past the polyhedron edges of a given polyhedron until they intersect.To stellate a dodecahedron, you need to extend out each of its planes. If you extend them out, you can get progressively larger stellations (right column of images from Wolfram):
It's neat to rotate around this figure and try to imagine the tiny dodecahedron inside. Although I already gave the model away...