BBC News: Berlin monument to 1989 democracy heroes

Groundbreaking ceremony for the Monument to Freedom and Unity in central Berlin. "Freedom and unity aren't static conditions, they require participation and interaction", explains Sebastian Letz, Creative Director and Partner, the concept called "Citizens in motion". "It’s a social sculpture. When at least 30 more people are on one half of the bowl than on the other, the monument will begin to move, slowly and gently. The movement will be achieved by visitors working together as a group: by the strength of their movement, it will come alive." More on BBC News: www.bbc.com/news/world-europe