An ideological and physical barrier fell on 9 November 1989 in Berlin. For 28 years, this 155 km wall divided Germany in two, separating friends and family. The recent discovery of some documents reveals the stories of those who managed to escape to join their loved ones, or simply to regain their freedom. Demonstrating imagination and courage, some dug tunnels to get under the Berlin Wall, others inflated balloons to fly over it, while others disguised themselves with fake uniforms. By combining archives, reconstitution sequences and intrigue scenes, this documentary plunges us into a Berlin that has now disappeared, through the prism of the art of escape under the GDR.

M.C. Escher is among the most intriguing of artists. In 1956 he challenged the laws of perspective with his graphic Print Gallery and his uncompleted master-piece quickly became the most puzzling enigma of modern art. Fifty years later, can mathematician Hendrik Lenstra complete it? Should he?