A beautiful cumulus cloud with pileus was photographed in Ethiopia: iridescent aura evokes a UFO or a psychedelic angel:
A halo of iridescent light silhouette floats a cloud as the aura of an angel or a UFO psychedelic plasma, in this photo taken in Ethiopia by Esther Hevens image.
Contrasted by the dark cloud, light is a divine hat.
A pileus cloud or pileus is formed above cumulus when a stream of cold air. Such clouds is formed by uniform water droplets diffract sunlight creating a rainbow of colors.
Generally the effect is overshadowed by the sunshine, but in this case the dark cloud blocking helps brightness, revealing the spectrum of light behind.
Original post: [New Scientist]