"Programming the Urban Surface" by Alex Wall is describing about how urban surface connects with architects and landscape. Architects address some elements to the environment and let their design fit with the site. I think that urban surface is the most important layer for architecture because it combines with plan of architectures and landscape, it lets everyone walk on it and walk through it from exterior to interior. Throughout the article, it shows several examples and strategies to explain how to sew up the urban surface. They let the surface be connective and have relationship between different places. they also create activities for people use, but programs are flexible at the same area. In that way, the urban surface will not be decentralized. Rather, it is a continuous network of reconstructing cities.