 Now diamond is a diamond. It's just small. The size is about 100 nanometers. So basically we use a very tiny, focused laser beam to levitate the narrow diamond. We try to control the speed of levitate a narrow diamond inside a vacuum chamber and we study this effect in different conditions. And we learned that the signal that emits from the nitrogen vacancy center depends on the surrounding gas. This finding suggests that you can use nitrogen vacancy center for gas sensing applications, for example, oxygen gas sensing. Normally when you think about quantum physics, you think about atom, a very, very small object. But now we hope that we can test quantum physics at a little bit more macroscopic level using nanoparticle.