All of that you find here are the clouds of Tokyo. These are not special clouds, but clouds when you look at the sky in your daily life. With the Zen spirit, just trying to shoot vaguely.
When shooting clouds, I can feel the speed of rotation of the earth. Insects are born and die, flowers bloom and die. Everything is at that speed. Probably, if you can feel and move at that speed, you won't get so tired.