Pohaku is a colorful game developed by mathematician Harry L. Nelson and published by Norman & Globus (sciencewiz.com; available at Borders). It is played with 24 square "stones" (pohaku means "stone" in Hawaiian) derived from the three-colored squares, known as MacMahon squares, invented by mathematician Percy MacMahon more than a century ago. A MacMahon square is divided into four triangles, each of which can be one of three colors. A complete set, shown below with the numbering system used in Pohaku, comprises 24 squares-every possible combination of three colors. (Stones that are merely rotated versions of each other are not considered different. For instance, a stone with three yellow triangles and one blue triangle, like stone 3, would be the same no matter where the blue triangle appeared.)
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机译：Pohaku是由数学家Harry L. Nelson开发并由Norman＆Globus（sciencewiz.com；可在Borders购买）发行的彩色游戏。它与24个正方形的“石头”（pohaku在夏威夷语中为“石头”）一起玩，该正方形是由数学家Percy MacMahon于一个多世纪前发明的三色正方形（称为MacMahon正方形）衍生的。 MacMahon正方形分为四个三角形，每个三角形可以是三种颜色之一。一套完整的套件，包括Pohaku中使用的编号系统，如下所示，包括24个方格，每种可能的三种颜色组合。 （彼此只是旋转版本的石头不会被认为是不同的。例如，具有三个黄色三角形和一个蓝色三角形的石头，如石头3一样，无论蓝色三角形出现在何处都是相同的。）
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