These are two of the three largest structures within the Inner Court. On the right is the Hall of Celestial and Terrestrial Union, meaning the intersection of heaven and earth. Also called the Hall of Union, this square, modest building with a single roof was used by the empress to host annual celebrations among the princes and their wives. Jiaotai dian now displays 25 seals of the Qing dynasty. Next to it is the Palace of Earthly Tranquility. This was the living quarters of the empress during the Ming dynasty. Later it was subdivided into an altar plus postnuptial rooms. A recently married emperor and empress would spend their first few days together in this bridal suite.