This isn't a photo but a video done by some of the Egyptians who are not happy with the military coming in and running Egypt (not that they ever really left) after everyone took to the streets to declare their total disillusionment with the Muslim Brotherhood government (which was really only for the Muslim Brothers and not for the rest of Egypt). This video is to remind those who remember the brutal excesses of the security forces and army in putting down protests both under the initial military rule and under the Muslim Brothers (who had no objections as long as they were ruling, oddly enough) and to encourage them to protest in a peaceful way daily.
Most Egyptians live in apartments, no matter where they live, since usable land is so scarce here. We only use about 4% of our land and the rest is empty desert with sand, more sand and still more sand. So if you get people every evening leaning out of apartment windows and tapping on pots and pans in protest, it could get quite noticeable.
The film is well-made and the tune is very catchy. Nice idea. If you want to borrow this for your own protests, I'm sure no one would mind.