Watch Online Free HD Solarmovies. In Hoppla!, two choreographies by Anne Teresa De Keersmaeker are brought together and performed to the music of the Hungarian composer Béla Bartók: Mikrokosmos, seven short works for two pianos, and Quatuor no. 4, Bartók’s fourth string quartet. The reading room of the Ghent University library, designed by the renowned architect Henry Van de Velde, serves as location.