本书的主角是一个可爱的五边形小明。发父母为了他长大后能取得更好的成绩，从小带他去很多地方学习，包括三角形村、圆润村、多角村，但是小明并没有学会如何成为规规矩矩的三角形、圆润的圆形和以角的数量取胜的多角形他很迷惘。后来，他遇到了智者四边形和破茧而出的蝴蝶，他们的话让小明对自己有了新的认识。小明终于知道，"我不一定要成为和别人一模一样的人，做我自己最重要。"
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