Mandala is a sort of world, ever-changing. Life will also be like this, in accordance with a certain law, carrying out ever-changing creations. No matter how much our current material life is different from that of ancient people, the changes in our spiritual life do not seem to have changed much. The exploration of the universe, why we live on the earth, and whether there are extraterrestrial life unexpected to us, although many legends later give the answer, it is still an unsolved mystery. Is our world a testing ground for aliens?