塑料常数的定义很简单，它就是方程x^3=x+1的唯一实数根，约等于1.3247或4/3，它的根式表达形式：（上图：20个不同的正方形，当边长差距达到4/3时，你会把它们分为两类）（上图：左边为黄金分割的构造，右边为“塑料常数”的构造。取一条线和两个分点，构造6条不同长度的线段，使得相邻长度两条线段比相等。比值即为“塑料常数”）（上图左:按黄金分割比切割的正方形。上图右：长宽高按‘塑料常数’构造的立方体，你能看出'清晰感'吗？）（上图：我随手找的“内六角扳手尺寸表”，这里面有“塑料常数”吗？）微信搜索：dalaoli_shuxue，订阅“大老李聊数学”公众号
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