If you are at the center of Tokyo at dusk, it can be one of the good options to go up to a skyscraper and catch a whole view of the town. Today, the big cloud stayed blue whereas the buildings got orangish. This seems to be because the very thick cloud on the right prevented the sun from shedding light into the cloud above but not into the buildings below. The contrast of the blue and the orange is only available from a high place.
After the dusk, the sky got transparently blue - bluer than any other sky that I have ever seen. The volume of the cloud is overwhelming in such a compact city. It must be a special gift from the sky today.