It happens over most of the world? I can't begin to imagine what might cause that to happen. Your world must have a particularly unique magnetic field.

[ physics are already broken in Trench, so it should come as no surprise other worlds might also have unique features, and yet... ]

When particles in the upper atmosphere interact with the solar wind from the sun, we see the light show you describe. The combination of anbaric forces makes the boundaries between one world and the next much thinner, allowing light to cross. Under the right conditions, I was able to take a special photogram of a city in the sky.

What I was really looking for was called Dust. It has no charge and is invisible to the naked eye. It has the unique property of being selective, as well. A mountain with a tunnel carved into it will attract more than one never touched by man, and a wholly artificial structure gathers the most Dust of all. Adults are bathed in it, but children attract hardly any at all.

[ he watches, curious to see if chrollo might make any sense out of those examples. ]

As you might imagine, these revelations were alarming to those who fear most what they fail to understand.