The German Democratic Republic (GDR) may have collapsed in 1990, but its physical effects are on display at this year’s Venice Biennale, where a reconstruction of a communist housing complex by artist Sung Tieu has cloaked the facade of the German Pavilion. Covering the underlying fascist architecture, commissioned by the Nazi party in 1938, the monumental work suggests how easily one regime can be supplanted by another.  Inside the pavilion, an immersive installation by the late Henrike Naumann moves us from the exterior to within the domestic realm, staging a confrontation between personal and political, and between East and West.  Naumann’s sudden death earlier this year inevitably adds an additional layer to the presentation.…