Why is Giotto associated with the proto-Renaissance?

Giotto is associated with the proto-Renaissance because his work marked a significant departure from the flat, stylized traditions of the Middle Ages, introducing a new pictorial style that anticipated the innovations of the Renaissance.123

His importance to this period is defined by several key characteristics:

• Psychological Realism: Unlike his predecessors and contemporaries, such as Cimabue or Duccio, Giotto imbued his figures with great psychological penetration. In works like the Arena Chapel frescoes, he used gestures, expressions, and postures to convey human emotion and individual responses to grief.24
• Structural Simplicity: Giotto moved away from hierarchical, decorative compositions toward a clear, simple structure. He focused on narrative power, rendering the essential elements of a scene with dramatic economy.24
• Naturalism: His work reflected an emerging interest in individualism and the observation of the natural world, which were central themes of the proto-Renaissance. This shift toward naturalism and spatial coherence laid the groundwork for the scientific perspective and anatomical studies that would fully develop in the 15th-century Renaissance.25

Because of these contributions, later historians and theorists, such as Giorgio Vasari, credited Giotto with breaking away from medieval conventions and ushering in a "good modern manner".3