Shops and restaurants can help blur class lines, but interactions may not be meaningful enough to boost social mobility

"Titanic," James Cameron's 1997 multi-Oscar-winning movie, focused on the tragic love story of itinerant artist Jack and upper-class socialite Rose. Among their other on-board adventures, they dined in the first-class section of the ship before joining revelers dancing in the third-class quarters. Their exploration of the ill-fated vessel represents a transgression—not just of public boundaries, but of class ones too.