Kiyoko Urata

From around the 18th century, making Temari was enjoyed as a popular pastime among ladies. They seem to be usually decorated with dihedral, tetrahedral, or octahedral symmetry, because icosahedral symmetry was not common in Japan then. Around 1950, a high school teacher of mathematics taught a Temari artist how to decide the position of vertices of a spherical regular icosahedrons to use one of the sphere's poles as one of the icosahedron's vertices first, then to wind a string along a great circle through the pole and to plot a point on the great circle from the pole whose distance is G/6+G/100, where G is the length of the great circle to be the second vertex of the icosahedron. This is how icosahedral Temari was started.