The Dome of San Lorenzo – Turin, Italy - Atlas Obscura
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The Dome of San Lorenzo

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul." 

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The Real Chiesa di San Lorenzo (Royal Church of Saint Lawrence) is a religious building in Turin. The church, located near the Royal Palace, was commissioned by the ruling Savoy family to celebrate their victory during a 1557 battle that happened on the day of Saint Lawrence. Construction began in 1634 and was completed in 1680.

The church was designed by Guarino Guarini, one of the greatest Baroque artists of the 17th-century. Guarini transformed the previous building into a central-plan church surmounted by a large dome. The dome itself is Guarini’s masterpiece. Starting from below, it begins with a circular base decorated with eight windows. Eight intersecting arches support the dome forming an eight-pointed star that resembles characteristics of mosques, with smaller windows adorning the areas between the arches. On the top, the lantern is surrounded by an octagonal shape.

The combination of these geometrical features and the reflection of light creates shapes that resemble faces, with the bottom window as the mouth, the smaller opening above comprising the nose, and the two upper windows as the eyes. Due to the position and shape of the eyes and mouth, these features have been called the “face of the devil” (“faccia del diavolo”), while Guarini himself described the dome as creating “terror of the human soul.”

From outside, the dome stands out on a side of Piazza Castello, contrasting with the simple façade and short bell tower. Part of the church also serves as a museum of the Holy Shroud.

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