Oh, ok. This is something I learned in my high school artclass. It's all about angles and perspective. For example, look at this
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Look at the top of those buuldings. Notice that the tops of those buildings all angle down torwards the center of the image. Notice how the bases are all straight vertical lines. This is on the perspective that you are shorter than the buildings, that you're looking up.
Now these are all angled down torwards the center. If you angle the lines to the center up, it'll look a little strange if you don't complete the top of the building. Angling them up actually will give you the impression that you are higher than the building. For example
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Notice how the ones in the foreground are all so slightly angled up, thus you can see the rooftops and stuff. Now look at the ones in the background, where you can't see the roofs. They're all horizontal or slightly angled downward towards the cented of the image. Because again, you can't see the roofs for you are on a lower level.
Yeah, that's about the best I can explain.
Edit: So I noticed in my drawing that my buldings were pointed away from the center. This also works too, but again notice thet they are angled down and away from the center. Torwards the center works best if you want to show perspective at like an intersection or something. Away works if you just want to give the vibe of a bustling city.
Hopes that helps.