Stills from Sofia Hultén's video Events with Unknown Outcome.
Some info on the work taken from the artist's website is below:
I placed various objects (beer crates, a blanket, ball and plastic bag) in the park surrounding the last border watchtower still standing since the GDR in Berlin. I secretly videotaped whatever happened to the objects from the vantage point of the tower.
More work by this artist can be found on her website