In ancient Japan, it was thought that "God and the Spirit dwells in the clouds". Since the cloud blocks the light of the sun, make it rain, so it is believed it have a large impact in people's lives.
Japanese of ancient times, in particular, the upper class and aristocracy, are fond of having work of art and clothing that drawn clouds. It had been recognized that "cloud with a large force will protect himself".
In addition, by drawing a cloud in gold, it was also intended to design a gorgeous space.