21 Cake is a popular gourmet cake shop in Bejing. The colorful design for their 450-square-meter office by People’s Architecture Office plays with layering (like a cake!) the primary colors of red, yellow, and blue to create a full spectrum of changing colors. Selected walls, namely those in circulation areas, are made of laminated colored glass. A skylight above a central atrium brings natural light through a second floor glass bridge as well as through the layers of colors along the staircase. A walk through the office space changes the vantage point for the interactions between natural light, artificial light, and layers of color.