quadrature

    A type of illusionistic decoration in which architectural elements are painted on walls and/or ceilings in such a way that they appear to be an extension of the real architecture of a room into an imaginary space. It was common in Roman art, was revived by Mantegna in the 15th century, and reached its peaks of elaboration in Baroque Italy. The greatest of all exponents of quadratura was probably Pozzo, in whose celebrated ceiling in S. Ignazio, Rome, architecture and figures surge towards the heavens with breathtaking bravura. Unlike Pozzo, many artists relied on specialists called quadraturisti to paint the architectural settings for their figures (see Guercino and Tiepolo, for example).

quatrefoil

    decorative motif in Gothic art consisting of four lobes or sections of circles of the same size.

Quattrocento (It. "four hundred")

    The 15th century in Italian art. The term is often used of the new style of art that was characteristic of the Early Renaissance, in particular works by Masaccio, Brunelleschi, Donatello, Botticelli, Fra Angelico and others. It was preceded by the Trecento and followed by the Cinquecento.