For a rare public show, beloved but privately owned works by Germany’s most celebrated living painter are being released from their homes hanging in dining rooms, bedrooms and even bathrooms for a short time only. The public can now see these works by star painter Gerhard Richter, seldom-viewed in public, together for the first time thanks to an exhibition in the western German city of Dusseldorf in one of the city’s most important galleries. In a show called “Gerhard Richter. Hidden Treasures,” the Museum Kunstpalast is exhibiting more than 120 works by Richter from private collections starti…