A Thin and Perfect Mask
The Glass Man elucidated a theory that there are many other worlds that exert influence on Eberron. According to this idea, there are places on Eberron where the influence of another place is strong—these places are manifest zones. In these places, the Glass Man claims, the world is “a thin mask” over much stranger forces. One such place, supposedly, is the city of Sharn itself. Its connection with someplace other is what causes most of the flight magic in the city to function. The floating Skyway district, for instance, would be impossible to imagine elsewhere.