Grotesque. Since at least the 18th century, grotesque has come to be used as a general adjective for the strange, mysterious, magnificent, fantastic, hideous, ugly, incongruous, unpleasant, or disgusting, and thus is often used to describe weird shapes and distorted forms such as Halloween masks. In art, performance, and literature, however, grotesque may also refer to something that simultaneously invokes in an audience a feeling of uncomfortable bizarreness as well as sympathetic pity. More specifically, the grotesque forms on Gothic buildings, when not used as drain-spouts, should not be called gargoyles, but rather referred to simply as grotesques, or chimeras. The English word first appears in the 1560s as a noun borrowed from French, and comes originally from the Italian grottesca, an extravagant style of ancient Roman decorative art rediscovered at Rome at the end of the fifteenth century and subsequently imitated. The word was first used of paintings found on the walls of basements of ruins in Rome that were called at that time le Grotte. These 'caves' were in fact rooms and corridors of the Domus Aurea, the unfinished palace complex started by Nero after the Great Fire of Rome in CE 64, which had become overgrown and buried, until they were broken into again, mostly from above. Spreading from Italian to the other European languages, the term was long used largely interchangeably with arabesque and moresque for types of decorative patterns using curving foliage elements. Remi Astruc has argued that although there is an immense variety of motifs and figures, the three main tropes of the grotesque are doubleness, hybridity and metamorphosis. Beyond the current understanding of the grotesque as an aesthetic category, he demonstrated how the grotesque functions as a fundamental existential experience. Moreover, Astruc identifies the grotesque as a crucial, and potentially universal, anthropological device that societies have used to conceptualize alterity and change. In art, grotesques are ornamental arrangements of arabesques with interlaced garlands and small and fantastic human and animal figures, usually set out in a symmetrical pattern around some form of architectural framework, though this may be very flimsy. Such designs were fashionable in ancient Rome, especially as fresco wall decoration and floor mosaic. Stylized versions, common in Imperial Roman decoration, were decried by Vitruvius who, in dismissing them as meaningless and illogical, offered the following description: For example, reeds are substituted for columns, fluted appendages with curly leaves and volutes take the place of pediments, candelabra support representations of shrines, and on top of their roofs grow slender stalks and volutes with human figures senselessly seated upon them. When Nero's palace in Rome, the Domus Aurea, was inadvertently rediscovered in the late 15th century, buried in fifteen hundred years of fill, the first breakthrough was from above, so that those keen to see the rooms had to be lowered down into them on ropes, completing their resemblance to caves, grotte in Italian. The Roman wall decorations in fresco and delicate stucco were a revelation. The first appearance of the word grottesche appears in a contract of 1502 for the Piccolomini Library attached to the duomo of Siena. They were introduced by Raphael Sanzio and his team of decorative painters, who developed grottesche into a complete system of ornament in the Loggias that are part of the series of Raphael's Rooms in the Vatican Palace, Rome. The decorations astonished and charmed a generation of artists that was familiar with the grammar of the classical orders but had not guessed till then that in their private houses the Romans had often disregarded those rules and had adopted instead a more fanciful and informal style that was all lightness, elegance and grace. In these grotesque decorations a tablet or candelabrum might provide a focus; frames were extended into scrolls that formed part of the surrounding designs as a kind of scaffold, as Peter Ward-Jackson noted. Light scrolling grotesques could be ordered by confining them within the framing of a pilaster to give them more structure. Giovanni da Udine took up the theme of grotesques in decorating the Villa Madama, the most influential of the new Roman villas. In the 16th century, such artistic license and irrationality was controversial matter.