From the photographer’s caption: “Yesterday a couple thousand teenagers gathered in front of the Planetarium in Parque Palermo for a facebook-organized, flash mob pillow fight [lucha de almohadas]. Beatrice has a great set over at flickr and you should also check out this video from YouTube, it’s from the pillow fight from 2006 but you get a sense of what it’s like to be in the middle of it. The event also has its own official blog, Lucha de Almohadas.”