La teorica della pittura, ovvero, Trattato delle materie più necessarie, per apprendere con fondamento quest' arte
A 1739 Italian treatise on painting theory by Antonio Franchi, printed in Lucca, aimed at students learning the art on a sound footing. Its pictures are plain line diagrams of perspective constructions: lettered points A through E, straight sightlines converging on a viewpoint, and boxes and bodies set against ruled ground lines. A designer could take from them a clear method for plotting depth and foreshortening with minimal ink.
