The two Donatello's characteristic formal contributions are encountered in the work for Baptistery of Siena. He demonstated it through organizing the relief by a rigorous application of the rules of perspective. Even though it was created at a shallow deptht, this technique makes each figure of a scene emerge clearly and very logically. This technique is determined as a flattened relief.
Shadowing mirror since uh yeah
Photography, also known as Camera Obscura, is an art form invented in 1830s, becoming publicly recognized ten years later. Today, photography is the largest growing hobby in the world with the hardware alone creating a multi-billion dollar industry.
Hope this helps. Have a nice day
