Expressionistic motifs are even more dominant inside the house. The high vaulted and fluted ceiling has been painted lemon yellow. It is separated from the wall by a zigzag cornice which hides lamps. The use of reflected shadeless light coming from a hidden source was very innovative in 1920s. The walls of the sitting chamber are ultramarine, and the jagged door and window jambs are rusty brown.
Furniture is of light birch plywood decorated with contrasting black details.
The Riigikogu building is unique among the parliament buildings of the world, since it is the only Expressionistic one in the world. In 1997, the sitting chamber was restored. Inauguration of the restored chamber took place on September 8, 1997. Historian Mart Kalm consulted the architects in the matters of the history of architecture, colour expertise of the hall was made by the lecturers of the Academy of Arts Kaarel and Mari Kurismaa. Helve Ilves analyzed chemically specimens of paints and, in this way, established the exact composition of the paints used originally in the interior decoration of the hall.