The scena per angolo, a phrase coined by Ferdinando Galli Bibiena in his 1711 publication, L' archittetura civile, is the consummate expression of high baroque scenography. Per angolo designs for stage sets typically show corners of palatial interiors or courtyards through the use of multiple vanishing points [Fig. 14]. Secondary diagonals which radiate off the major oblique lines defining the space lead the eye, as well as the understanding, into an implied infinity beyond the frame of the proscenium and mirror the early eighteenth century's fascination with, and indeed insistence upon, boundless space. Even theatrical designs whose main vanishing points are on the centre line rely heavily on multiple minor vanishing points to provide the essential dynamic diagonal thrust beyond the implied boundary of the proscenium.