Guerrilla art and public memory

The civic powers write -- sometimes in floral text -- messages welcoming you into the municipality. But what about the unofficial spaces? Those that were not named by the city, but named themselves? The municipalities within municipalities? The lost 'hoods? The ghost ways?

This July, if you're in the vicinity of the green space near the Georgia Viaduct, at 200-block Union Street -- the old site of Hogan's Alley -- check out Lauren Marsden's installation, lovingly planted with support from HAMP and friends.