Shape Changers
"For a long time, humans observed and described the human body. Then came the body builders— instead of simply observing the human body they decided to shape their bodies. And they have done this successfully beyond what many had dreamt possible. There are, however, strong limitations to how much a human can shape his or her body. Similarly, the asset price process can be shaped, but there are strong limitations to this. A body builder can increase the size of his biceps or pectoral muscles, but cannot (at the moment, anyway) turn his arms into the wings of an albatross. In the same way, we can transform many — but far from all — jumps into what is close to diffusion. "
