Berlin Wall Line at Potsdamer Platz

Today I took a chance trip to Postdamer Platz and found a place where the Berlin Wall has been taken down but replaced with a visible trace, as a reminder of its one-time presence:
Today I took a chance trip to Postdamer Platz and found a place where the Berlin Wall has been taken down but replaced with a visible trace, as a reminder of its one-time presence: