While online socialization improves communication efficiency, it may reduce emotional connection and increase feelings of loneliness when overused. In response, designers and researchers have tried to promote face-to-face communication in public spaces through environmental design, interactive technology, and social engagement mechanisms. However, there is still less research and design for real-time interactive gesture interaction techniques for enhancing offline socialization. Therefore, this paper proposes an innovative social enhancement method based on functional public space in the offline community. Meanwhile, a gesture-interactive image control installation is designed using Touchdesigner (TD) and Leapmotion. This installation allows audiences to change visual content through the interaction of hands, thus building new social connections in physical space. The research design includes: investigating the current social situation in communities’ public spaces and analyzing the social needs of different user groups; designing an interactive installation based on real-time gesture interaction + shared visual experience to test the impact of varying interaction methods on social experience; observing users’ behavior during the experience of the installation through experimental research and evaluating the effectiveness of the design. This study verifies how interactive technology promotes social behavior in physical spaces. To some extent, it explores the method to reshape the offline social ecosystem through interactive technology, alleviating loneliness in modern society and offering new methods to strengthen offline emotional connections among young people. The result shows that this installation can break through barriers of socialization between strangers, improve the willingness to communicate in offline situations, and increase the sense of belonging in communities.