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Architecture: origins and characteristics

The Baroque style of architecture was a result of doctrines adopted by the Catholic Church at the Council of Trent in 1545–1563, in response to the Protestant Reformation. The first phase of the Counter-Reformation had imposed a severe, academic style on religious architecture, which had appealed to intellectuals but not the mass of churchgoers. The Council of Trent decided instead to appeal to a more popular audience, and declared that the arts should communicate religious themes with direct and emotional involvement. Similarly, Lutheran Baroque art developed as a confessional marker of identity, in response to the Great Iconoclasm of Calvinists.

Baroque churches were designed with a large central space, where the worshippers could be close to the altar, with a dome or cupola high overhead, allowing light to illuminate the church below. The dome was one of the central symbolic features of Baroque architecture illustrating the union between the heavens and the earth. The inside of the cupola was lavishly decorated with paintings of angels and saints, and with stucco statuettes of angels, giving the impression to those below of looking up at heaven. Another feature of Baroque churches are the quadratura; trompe-l'œil paintings on the ceiling in stucco frames, either real or painted, crowded with paintings of saints and angels and connected by architectural details with the balustrades and consoles. Quadratura paintings of Atlantes below the cornices appear to be supporting the ceiling of the church. Unlike the painted ceilings of Michelangelo in the Sistine Chapel, which combined different scenes, each with its own perspective, to be looked at one at a time, the Baroque ceiling paintings were carefully created so the viewer on the floor of the church would see the entire ceiling in correct perspective, as if the figures were real.

The interiors of Baroque churches became more and more ornate in the High Baroque, and focused around the altar, usually placed under the dome. The most celebrated baroque decorative works of the High Baroque are the Chair of Saint Peter (1647–1653) and St. Peter's Baldachin (1623–1634), both by Gian Lorenzo Bernini, in St. Peter's Basilica in Rome. The Baldequin of St. Peter is an example of the balance of opposites in Baroque art; the gigantic proportions of the piece, with the apparent lightness of the canopy; and the contrast between the solid twisted columns, bronze, gold and marble of the piece with the flowing draperies of the angels on the canopy. The Dresden Frauenkirche serves as a prominent example of Lutheran Baroque art, which was completed in 1743 after being commissioned by the Lutheran city council of Dresden and was "compared by eighteenth-century observers to St Peter's in Rome".

The twisted column in the interior of churches is one of the signature features of the Baroque. It gives both a sense of motion and also a dramatic new way of reflecting light.

The cartouche was another characteristic feature of Baroque decoration. These were large plaques carved of marble or stone, usually oval and with a rounded surface, which carried images or text in gilded letters, and were placed as interior decoration or above the doorways of buildings, delivering messages to those below. They showed a wide variety of invention, and were found in all types of buildings, from cathedrals and palaces to small chapels.

Baroque architects sometimes used forced perspective to create illusions. For the Palazzo Spada in Rome, Francesco Borromini used columns of diminishing size, a narrowing floor and a miniature statue in the garden beyond to create the illusion that a passageway was thirty meters long, when it was actually only seven meters long. A statue at the end of the passage appears to be life-size, though it is only sixty centimeters high. Borromini designed the illusion with the assistance of a mathematician.