欧洲的边界，保罗克利的一幅画，沃尔特本杰明的一首诗，一部关于昨天和今天的电影，以及识别事件背后的难度。

A border in Europe. A painting by Paul Klee. A poem by Walter Benjamin. A film about yesterday and today, and how difficult it is to recognize one behind the other.