In the Nativity facade of the Sagrada Familia in Barcelona, a few three-dimensional star shapes appear. Although it is widely accepted that Gaudi hardly ever used polyhedra in his works, the analysis of the shape of these stars reveals that, under an organic appearance, there is a hidden morphology that can be explained by using theoretical models of star polyhedra. In this paper will be discussed some of the possible theoretical models suggested, to point out their place on the facade and what their meaning is, focusing on the geometrical and astronomical meaning of some of them.

中文翻译：

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为圣家堂的星星建模

在巴塞罗那圣家堂的耶稣诞生立面上，出现了几个三维星形。尽管人们普遍认为高迪在他的作品中几乎从未使用过多面体，但对这些星体形状的分析表明，在有机的外观下，存在着一种可以用星形多面体的理论模型来解释的隐藏形态。本文将讨论一些可能的理论模型，指出它们在立面上的位置及其含义，重点介绍其中一些的几何和天文含义。