Photovoltaic + commercial complex demonstration benchmark, classic application of energy-saving renovation of existing buildings. The project is located in the center of Sanlitun, a world-class business district. Gain Solar Colored Glaze replaces the traditional curtain wall structure, with a dark blue appearance that is unified and atmospheric.

The design concept of the entire building originated from the "Book Slips" of the Han Dynasty. After being turned over, it formed a huge Möbius strip with a diameter of 180 meters, on which there is a steel structure ring corridor for tourists to walk.