First, there was a billboard swingset in Hong Kong. Now, there's a billboard merry-go-round in Prague. Well, it's really more of a billboard whirlygig, but the point is that another piece of advertising structure has been reclaimed by artists for some frivolous playtime. And unlike the Hong Kong piece, which was sanctioned for an event, this one seems to be a prank—the team of artists responsible mounted a rotating billboard (commonplace over there, apparently) via its maintenance ladder and turned it into a carnival ride with balloons and wooden swings. I almost asked myself why this sort of thing never happens in America, but then I remembered that we can't do any kind of stunts or people freak out.