MOst North Americans associate cardboard on the sidewalks with homeless people sleeping. However here it seems to be the standard flooring choice for social gatherings. It was normal in the evening or on weekends to see up to half of the floorspace in pedestrian walkways (+15's) and any covered area to be covered in flattened cardboard boxes. Groups meet and socialize in these places singing, playing games, and eating. The food we saw was incredible. Come morning everyone is gone and all the debris has been cleaned up. Pretty cool.