The presbytery of the basilica of the Monastery of San Lorenzo de El Escorial is closed on its eastern side by a monumental altarpiece that, apparently, is attached to the thick outer perimeter wall. However, at the height of the lower section and behind it, there is a vaulted space that has not yet been studied, and whose main interest is its function as a Transparente. This architectural device, a precursor of other solutions used later during the Baroque period, allows the rays of the rising sun to be introduced directly into the tabernacle and onto the high altar through a window positioned for this purpose. Our study deals with the succession of vaulted and lintelled spaces, arches and windows that make it possible to achieve such a singular effect, together with other aspects related to the perception of the whole, and to the geometry of light.

中文翻译：

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埃斯科里亚尔修道院大教堂的透明

San Lorenzo de El Escorial 修道院的长老会在其东侧被一个巨大的祭坛画封闭，显然，该祭坛画与厚厚的外周墙相连。然而，在下部的高度和后面，有一个尚未研究的拱形空间，其主要兴趣在于其作为透明物体的功能。这种建筑装置是后来在巴洛克时期使用的其他解决方案的先驱，它允许朝阳的光线通过为此目的而定位的窗户直接引入会幕和高坛。我们的研究涉及拱形和门楣空间、拱门和窗户的连续性，这些空间可以实现这种独特的效果，以及与整体感知相关的其他方面，