VIENNA.-At the outermost edge of the ceiling fresco in the Marble Hall of the Upper Belvedere two Turkish slaves eke out their existence among allegories of princely virtues. The young Austrian artist Franz Kapfer positions large mirrors exactly underneath these pictures of lamentation and tyranny, on a floor covered with blood-red foil. A purist lattice structure rises up between the mirrors like an abstract “castrum doloris”. In it Kapfer sees both a “Wunderwürdiges Kriegs- und Siegs-Lager” of Prince Eugene (Wondrous War and Victory Encampment), as well as the silhouette of a Turkish tent. Intervention: Franz Kapfer is on view at the Upper Belvedere through March 1, 2009.