this is an edited version. This blue is a lie. When the sky has turned nightly, my eyes see blue colour in the air no more. The blue colour appears in the air in twilight, dusk, not at night. At night the air just appears to be black, at least to my human eyes. In children's picturebooks, night sky is blue, but it is not true. But I love that untrue expression of night air's colour. So I like this version, too.