I'm looking for an explanation for the presence of large geometric luminescent formations that are found to be embedded in the infrastructure of a city.
They must be esentially undetectable to the average human but show up clearly on special cameras (mid/far infrared or Thz gap). These formations could effect humans or their environment but only in ways that are hard for an average person to notice, or easy to attribute to other causes.
The best explanation would be the most linked to our current understanding of physics, but need not be the most probable.
When imaged they might appear something like this: