When we think about creating something piece by piece, we usually think of what we can add to create a hole. For example, the Great Pyramid of Giza in Egypt. 481 ft tall, 216 layers, and 2.5% million individual stone blocks. This oldest of the seven wonders of the ancient world shows how an additive process can produce a result far greater than the sum of its parts. By contrast, consider the statue of David. Its creator, Michelangelo, used a method known as subtractive sculpture, where material is removed f ...