Illusionistic ceiling painting, which includes the techniques of perspective di sotto in sù and quadratura, is the tradition in Renaissance, Baroque and Rococo art in which trompe-l'œil, perspective tools such as foreshortening, and other spatial effects are used to create the illusion of three-dimensional space on an otherwise two-dimensional or mostly flat ceiling surface above the viewer. It is frequently used to create the illusion of an open sky, such as with the oculus in Andrea Mantegna's Camera degli Sposi, or the illusion of an architectural space such as the cupola, one of Andrea Pozzo's frescoes in Sant'Ignazio, Rome. Illusionistic ceiling painting belongs to the general class of illusionism in art, designed to create accurate representations of reality.

Parma Cathedral is a Roman Catholic cathedral in Parma, Emilia-Romagna (Italy), dedicated to the Assumption of the Blessed Virgin Mary. It is the episcopal seat of the Diocese of Parma. It is an important Italian Romanesque cathedral: the dome, in particular, is decorated by a highly influential illusionistic fresco by Renaissance painter Antonio da Correggio.