These techniques allowed for a blurring of the boundaries between painting, sculpture, and architecture that was signature to the movement. The chiaroscuro technique is the interplay between light and dark used in Baroque paintings fo dimly lit scenes to produce a high-contrast, dramatic atmosphere.

The techniques are

Explanation:

The Quadro riportato is a gold-frames, painted on the fresco, and seen in perspective.

The Quadrature is the illusion of depth so that they seem to extend the real architecture of the room into an imaginary space beyond the confines of the actual wall or ceiling.

And the Trompe l'oeil is the illusion of tridimensional effect based on a trick of perspective.