The Forbidden City's complementary colors

Quick answer：

The Forbidden City's complementary colors refer to the traditional Chinese architectural design that utilizes a color scheme based on the concept of complementary colors. The main colors used in the Forbidden City are red and yellow, which are considered complementary colors in Chinese culture. Red symbolizes prosperity and happiness, while yellow represents the emperor's divine authority. The use of these colors is not only for aesthetic reasons but also to convey the imperial power and status of the complex.