The Public Arts are becoming increasingly important in urban development. This project addresses public art as one of the major groups of elements in the urban built environment. The goal of this study is to design a digital platform through which citizens can co-create and discuss the urban built environment by sharing virtual artworks installed in urban spaces. More specifically, this study explores how user experience design can facilitate citizens’ participation in co-creating artworks within their environment. In fact, this investigation seeks to reach the highest level of citizen participation, which is citizen control. The sharing platform will encourage citizens to think about their surrounding environment and add artworks that make the space better. More important is the fact that these new works of art create a dialogue amongst citizens, and different social interaction may accrue around them over time. 
These public artworks will be virtual, digital works. People can easily create them in various free software such as Google Sketch up. Through this sharing system, they can locate their very own virtual, digital artwork in places in the city and share it with other citizens. A smart-phone application is designed to facilitate different user groups and their experiences. 
This smart-phone application supports two main user groups that may have different experiences with the interface. First, there are regular users that have limited experience with the artworks. Second, there are users who are creators and want to share their work with other people. This user group needs features to add models and locate them in desired places in the city. Diagram 15 shows the information architecture and task flows of this smart-phone app.