Why is Giotto considered an important forerunner of Renaissance art?

Giotto is considered a vital forerunner of Renaissance art because he broke away from the flat, stylized, and hierarchical traditions of medieval painting to establish a new, more humanistic style. Often described as the father of European painting, his work during the late 13th and early 14th centuries—a period known as the "proto-renaissance"—introduced several key innovations:123

• Psychological Depth: Unlike his predecessors, such as Cimabue, Giotto imbued his figures with genuine emotion and psychological penetration, allowing them to express individual responses to dramatic events.12
• Naturalism and Humanity: He focused on human beings as the primary subject matter, depicting them with a sense of dignity and passion that reflected a new, human-centered perspective.41
• Structural Clarity: His compositions, such as those in the Arena Chapel, utilized clear, simple structures and a sense of physical presence that moved away from decorative, linear styles.512
• Classical Revival: Giotto’s genius facilitated a true revival of classical ideals, emphasizing the natural world and human experience in a way that anticipated the artistic developments of the 15th-century Renaissance.412