This document discusses how numbers and compositional structure were used in Renaissance and Baroque period paintings. It explains that during these periods, artists carefully arranged visual elements based on principles of design to create unity and guide the viewer's gaze. The document also provides sketches that simplify and interpret compositional techniques of each period, with Renaissance works featuring simple geometry, bright colors and harmonious shapes, while Baroque works emphasized strong movement, contrast and dynamism. Overall, the document teaches how numbers were an integral part of compositional structure during these eras.