What does a city’s rooftops say about it?

I was on a late-night train between cities last week, and I kept catching glimpses of rooftops through the windows—tile, metal, green roofs, satellite dishes. Something about how they’re arranged, how much space they take up, whether they’re hidden or proud—it felt like reading a city’s secret mood. Like, what does it mean when a city doesn’t want you to see its roof? Or when every rooftop has a little garden? I’ve been thinking about this all week. What do your cities’ rooftops tell you?