Interior Space and Exhibition Design The One Mansion Xi'an Sales Center by Kun Peng Lv Xi'an The One Mansion is a sales center interior covering 998 square meters. The design draws on the culture of Chang'an, the ancient capital that marks the starting point of the Silk Road. A concept named wei-cheng guides the layout of the sales center. The traditional Chinese idea of a round sky and a square earth informs the forms and proportions. Light and shadow are used to create a calm and moderate atmosphere. Empty and solid areas are balanced so that the space carries traces of time.