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| A lottery device for shoppers at The Kyoto Center for Handicrafts. The first time in my life that I saw a heptagon outside a geometry book, and even useful! If you want some interesting heptagon math go to http://mathworld.wolfram.com/Heptagon.html |
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| A lottery device for shoppers at The Kyoto Center for Handicrafts. The first time in my life that I saw a heptagon outside a geometry book, and even useful! If you want some interesting heptagon math go to http://mathworld.wolfram.com/Heptagon.html |