I like to appeal to fantasy, even more so, perhaps this on a large scale could be detrimental to the environment or the behavior of birds for example. In this story, there is a machine that generates this bright ocean in the center of cities, generating a flat and radial energy region of several kilometers in the sky, that only makes another machine like this levitate, it does not levitate anything, only itself. Note that all vehicles have a bright blue part at their base.



The vehicles can only fly over the area around cities, to reach other cities, the two cities need to cross each other so that their bright oceans come in contact. Some particular structures can also create bridges.



These two senses have evolved to serve the surface, the "lateral line" makes them perceive minimal movements, they would perceive their presence for several meters. Yes, you got it right, that sense also connects them as a kind of collective consciousness, but only between them, they can't understand the minds of normal humans.



The "electric sense" makes them sensitive to electricity in the air and objects, because of this, they feel uncomfortable and tingling in the face when inhabiting cities like ours, with bombardment of radio and wifi signals. Their cities use other technological methods that do not involve radio signals or electricity. They use many cable and wire connections. The bright ocean causes them tingling, but a comfortable tingling.



Glad you are interested in my stories! Sorry if there is any anomaly in English, I used google translator.