Back in 1988, a short film - part documentary part art-film - was made, called Cycling the Frame. It was about the Berlin Wall back when West Berlin was still isolated from the West. The film follows a young girl (Tilda Swinton) and her thoughts as she cycles around West Berlin alongside the 96 mile long, iconic, symbol of the cold war.
The above trailer is for the 2009 follow up to the original film. Tilda Swinton cycles once again along the same route, commenting on what she sees. Brilliant stuff.
Check out www.Invisible-Frame.com for more about these two works.