Calm days before the typhoon. On a nice day, I look at the radiometer on the veranda. It is an attractive mobile whose glass object's blades (photosensitive plates) rotate when exposed to sunlight. This mobile, also known as a radiometer, is actually a device invented by W. Crookes in 1873 to measure radiation, and is also used as a scientific experiment tool. However, for us who need emotion more than science, it is an object that keeps catching our eyes and making us look at it, and for some reason, it makes us feel good and heals us every time we see it.