Invisibility cloak * Here comes the invisibility cloak

Invisibility and human teleportation, things that sounded mysterious in the last century, are now getting closer and closer to us. I was amazed by this for a while. But after reading Da Vinci's treatise on painting, I realized that what we call "seeing" is actually a very ordinary application of optical principles in the human eye, an "optical instrument". Invisibility is simply the method and process of deceiving this "optical instrument" by changing the properties of light. We all know that our noses are far inferior to those of dogs. In fact, our eyes, this natural "optical instrument", are far less sharp than the eyes of eagles, or even some man-made devices, such as the reconnaissance equipment used on American spy planes. These are very ordinary instruments, easily deceived. Once you think about it this way, it's really not surprising at all. The real difficulty with the invisibility cloak lies in the inability to find materials that can change the properties of light according to specific requirements. Now they have found this material, or are close to finding it, and thus the invisibility cloak has arrived.