It won't be long before someone discovers the potential of using architectural facades as a mass media real-time bar graph display. Before then, you can enjoy the newest video clip of Cold Mailman, titled "Time is of Essence" to discover how that might look like...
Recorded in the Oslo Municipality Groruddalssatsningen, the video shows how opening up the individual light switches of all apartments in several buildings to some smart, music-driven algorithm provides for some amazing imagery, especially for those neighbors living across the street.
By the way: it seems the video was not accomplished through smart electronic switching, nor through asking inhabitants to turn their lights on or off. It rather (I imagine) was created through painstaking frame-by-frame image manipulation starting from a set of predefined photos.
Watch the video below.