Like icosahedrons? Know about golden rectangles? Showcase the icosahedron, a regular polyhedron with 20 identical equilateral triangular faces, 30 edges and 12 vertices, with this geometry stamp. The icosahedron is one of five Platonic solids and includes golden rectangles (i.e., a rectangle whose side lengths are in the golden ratio, one-to-phi, or approximately 1:1.618). Mathematicians know that a distinctive feature of this shape is that when a square section is removed, the remainder is another golden rectangle -- one with the same proportions as the first. Educational geometric fun for all!
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