The Cloud art have to be in a unique like distinctive, individual, special, especial, idiosyncratic, quirky, eccentric, isolate. In meteorology, a cloud is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may compose the droplets and crystals.
This can also be any weather in the sky like fire lighting, rainbows, frozen in the sky, etc. You can have rainbows but the rainbow and the sky show about 50% of the sky.