Final answer:
The provided information does not specify the mixed-media installation by Xu Bing from 1990 C.E. However, it mentions Ai Weiwei's installations, such as 'Forever Bicycles', and also discusses Liu Wei's cityscapes.
Step-by-step explanation:
The mixed-media installation created by Xu Bing in 1990 C.E. does not appear to be clearly listed in the provided information. However, it is important to note that well-known Chinese artist Ai Weiwei has created several prominent installations during his career. For instance, Forever Bicycles is one of Ai Weiwei's installations that features an arrangement of bicycles to reflect on China's past, the cultural shift towards cars, and the layered meanings of objects in society.
Another artist, Liu Wei, also known for using unconventional materials to form cityscapes, represents a newer generation influenced by the rapid urbanization of China. His works digitally rendered before assembly highlight the themes of change, decay, and construction in cities.