The lights must belong to some municipal or district authority, or perhaps simply the owner of the tower. They belong to someone. People usually do not take well to people climbing roofs, except when they look like they live in the low-storied residences with roof gardens to escape the heat. It's trespassing.

"I should like to examine that light," he muses without a care for any of the above without expecting an answer. No harm in idle thoughts that are only serious to him. He angles the shadow in the opening of his hood down again at D.

"And how long have you lived in this city?" he asks, returning the thread of conversation to where it was: D not having seen this phenomenon before.