The Research On The Interactive Design Of City Public Art Under The Background Of Digital Age

City is a sort of structure and existence of materialization and culture formation during the process of human civilization, and institutionalization of the group survival management. Public art is a concentrating reflection of both modern city culture and city life's vision and passion. It is the public art that shapes, memorizes and keeps watch on the city with its unique way and annotates the orientation of the city's culture spirit and local features. Contemporary society, digitalization has become a new way of life which is used for describing the characteristics of new age since the mid-nineties of last century:decentralization, globalization, the pursuit of harmony, and empowerment. Digital technology comprehensively pushes forward in all areas of human life and changes people's way of life. Especially in the arts, the sudden emergence of digital art begins to possess an important status in the art palace, and the city public art has started to digital. In the digital city public art, interaction gradually becomes an important character. In traditional art, works and audience is a single and passive interaction. However, the interactive art encourages the participation of aesthetic objects; works of morphological changes are determined by the participant to turn the access to work into the experience process with full offun.The topic focuses on the "interaction system of digital city public art" as the research objectives, which systematically studies on the theory and methods of public art case based on the performance of digital public art. It seeks the interactive features of digital city public art under the influence of digital technology, exploring new development trends and creation methods of city public art in the future. Therefore, it provides theoretical reference and practical guide of for the development of city public art.To begin with, the paper expounds the origin and development of modern public art and deduces the history of public art and the relationship among different cities in history from the perspective of art history. It points out that the direction of digitalization is an inevitable result of public art in contemporary development. Subsequently, the paper prescribes the concept of public art in detail, distinguished "public art" and "public space art" and annotates the "new concept" of public art in contemporary China. And then, the examples of cities in Europe, the US, Asia and China were taken to explain the features and differences, developments and innovations of public art among them by analyzing some popular cases.In the second part, the paper describes the developing track of digital art. Since the 60s of last century, digital art from the date of the birth has a very close relationship with the development of computer. From the 1960s to the present, a stage in decades, a road of appearance and developing to flourishing of digital is sketched out. Technology is the driving force to promote the advance of the times in digital age. The paper discusses the technological line of realizing digitization and considers that the creation of digital art has the following four basic features:technicality, artistry, interaction and virtualization. Among them, the "interaction" has become a mainstream of digital art development nowadays and it changes our inspiration of creation and art experience though interactive design, network art communication and expenenceIn the paper, it explains in detail interaction features of city public art under the digital background. Digital art has universal cross-resistance, which affects our design conception in city public art. Then, it quotes the accepted theory of aesthetics and reveals the function of interactive thinking in city public art from three aspects:designers, sponsors and recipients. Add to this, it starts from the ontology and carries out on the interactive content research. Interaction includes four levels:based on human behavior, interface, social network and system experience of virtual environment. The four parts are on the same logic lever. It further indicates that it is the interaction as connection media that links four pairs of categories, from mechanical to electronic, from the visual to tactile, from the artists to readers, from reality to virtual. The four categories represent the different prominence changes brought by "interaction". The chapter is a theoretical analysis of interactive features.In next chapter, it analyzes the implementation process of interaction in city public art through a number of cases. The first is the establishment of interactive relation. The basic elements of interaction are consisted by the experience and feedback of the users. Followed by the interaction of the channel, the paper sets interaction system into four parts:input system, output system, communication and programming. In addition, it presents the process of building interactive system by giving an example of a complete interactive city public art in Germany. This chapter analyzes on the implementation of interactive system from technical aspects.In the following part, the paper begins to use specific case to describe the application of interactive city public art. Interactive system in city public art is formed by three elements:city public space, city artwork, and the main city public art. These three elements formed a multi-faceted, complicated interactive network. The paper based on different cases, expounding four different interactive forms of city public art:mechanical, experiential, creative and virtual types. The interactive, experience, technology, virtual and social work is a five-point design principle in interactive works. In the end of the chapter, there are four design elements of interactive city public art:formative element, sensory element, emotional element and functional element. This chapter analyzes interactive system in city public art from the actual case study and proposes the design rules and requirements for the creator of the interactive works.Lastly, the article describes a development tendency of interactive city public art in the future for readers. Interactive city public art is a blend of technology and art. The cooperation of artists, designers and scientists makes it possible for digital interaction to participate art as a new public. In the meantime, new artistic carriers and media begin to appear, such as the reformation of materials, the combination of sound, light, water, mist and other carriers. Even virtual mysteries and illusory "supra-arts carrier" come forth by virtue of computer and network, which beyond the substance of the physical presence but is a non-material form of existence. It offers readers an illusion of a possible future world. In the changes of the unknown world, the role of artists will become more integrated and the audience began to differentiate the levels. What's more, it proposes the value orientation of city public art-to serves the country or social values which need common effort of artists, community and the public.