Random interesting thing I saw in Myanmar

I finally had the chance to visit Myanmar in 2013. While I was there, I saw so many of this kind of strings hanging down in front of apartment buldings:

I was wondering what these things were. Turned out that  they were used to deliver things to the respective apartment from where these strings were originated from. If you want to see how they work, watch this video about media business in Myanmar, starting from minute 2:15. Smart isn't it? :)