Modular systems of proportion refer to a method of architectural design and composition that uses a standardized unit or module as the basis for scaling and relating various elements of a structure. This approach emphasizes harmony and balance by ensuring that different components—like columns, walls, and windows—are proportionally related to each other, creating a cohesive and visually appealing whole. During the Renaissance, this system was particularly important as artists and architects sought to revive the classical ideals of beauty and symmetry from ancient Greek and Roman architecture.