Clouds that appear in a swirl of various colors. As a cloud of this nature forms it is composed of small droplets which are almost entirely uniformly spread; however this may change as the cloud grows. When the sunlight interacts with these droplets, and at a greater angle from the sun (for instance, sunrise or sunset but with the sun often hidden behind other clouds), solar radiation is scattered by the small droplets. This scattering occurs for different wavelengths approximately equally. That is why these thin clouds appear in a swirl of rainbow colors.