Everyone has something to hide. That’s the theme for the third season of Big Love on HBO. And it’s also the idea behind new interactive murals created to promote the show by BBDO New York. These murals feature snapshots of people walking through a city street. Headphone jacks are built into each person’s head, so that passersby can use their headphones (or those provided by street teams) to plug in and hear each person in the mural’s inner and most personal secrets.