Who developed a system of proportions using a human figure with outstretched arms and spread legs?

Leonardo da Vinci developed a system of proportions using a human figure with outstretched arms and spread legs, famously illustrated in his drawing known as the Vitruvian Man. This iconic image is a representation of the proportions of the human body as described by the ancient Roman architect Vitruvius. Da Vinci's studies reflected a deep interest in the relationship between human anatomy and geometry. He sought to demonstrate how the human figure could serve as a basis for measuring and designing architectural spaces, emphasizing the harmony and balance found in nature. This research has had a lasting impact on art and design, illustrating how the human form can influence proportional systems in various creative fields.