Public art, as a spatial art, social, cultural, and aesthetic phenomenon, occupies an important position in the human social and cultural system. The touching power of public art is always expressed through the relevant laws of material and aesthetics, and at the same time, material, economic, and technological factors directly affect the development of public art. We should comprehensively examine it within the vast space of humanity, linking it with science, technology, and social life, and becoming a symbol with the characteristics of the times. The rapid development of modern technology has provided a broader space for the selection of media for public art. We are able to precisely control some "non solid media" such as liquids, sound, light and shadow, and even odors through technological means, and integrate their unique dynamic charm and strong contemporary atmosphere into the expression language of public art creation. This is also a contemporary manifestation of the combination of art and technology.

Zheng Jing is a professor and doctoral supervisor at the China Academy of Fine Arts, Secretary of the Party Committee and Vice Dean of the School of Sculpture and Public Art, leader of the Public Art discipline, head of the Department of Public Space Art (concurrently), academic director of the Art Engineering and Technology Studio, director of the China Sculpture Society, vice president of the China Branch of the International Dynamic Art Association, director of the Zhejiang Artists Association, vice president of the Zhejiang Sculpture Association, and vice president of the Zhejiang Sculpture Society.

He is committed to expanding the expression language and forms of spatial art through the integration of art and technology, exploring the methods and means of sculpture and public art research from a cross-border experimental perspective, and planning and organizing a series of themed international public art exhibitions, continuously leading and promoting the innovation and development of public art.

The lecture combines personal creation and cutting-edge art practices at home and abroad to elaborate on the expansion of media language and formal language from four aspects: non solid media - water, sound, air, and light. At the same time, combining the development characteristics of public art from "space to place" and "from scaffolding to engineering", truly shifting public art from aesthetic design to spatial poetics.