Donatello's notable formal contributions are found in his work for the Baptistery of Siena. He showcased this by meticulously applying the rules of perspective to structure the relief. Although crafted at a shallow depth, this method allows each figure in a scene to stand out distinctly and logically. This approach is known as flattened relief.
A line can represent delineation and, when materialized, can take on a linear form, potentially resulting in a sculpture devoid of tangible volume. In addition to depicting volume or space, lines may also imply movement.
