I was just watching it and thinking how it reminded me of a few moments I've spent in Warsaw, Boston, NYC, LA, etc. When I was rather young I never really considered how many people there were in the world, and still today I often forget. When I spend the night at a hotel near a tall building, I usually spend a good hour or two simply watching the building. There are a few moments during which I realize just how many people there are and that each single one of them has their own life. They each go to work and go on with their business. We all rush to do everything and don't even realize that there are tons of people doing the same thing. Yet we still think we are unique and that our worries matter.
This ^^ on top of what cyrus said.