Among the small number of Czech directors in competition at the Karlovy Vary festival, which gets underway next weekend, will be documentarian Martin Dušek, with his latest work Into the Clouds We Gaze. The witty filmmaker, who comes from the North Bohemian town of Česká Lípa, suggests as the starting point for our tour of “his Prague” the place where he works. One of the city’s most distinctive Functionalist structures, it’s a large building by Vltavská metro station owned by developer Orco and currently home to rather rough and ready office spaces.