Took this gorgeous cloud pic on the way to the Kingsway.
I was first caught by the subtlety of the central tip of the cloud illuminated by reflected light. But what wowed me were those giant fans of blue above the cloud (it doesn't show in this tiny pic but the cloud and those fans filled most of the sky - this is a very wide angle shot).
Those blue fans are not digital artifacts, those are naked-eye visible structures. They are some sort of shadow, though I don't quite understand the mechanism that cast them.