With the prevalence of sedentary behavior in modern office environment, anxiety symptoms among office workers have been on the rise. This study aims to explore a camera-based system for monitoring sedentary behavior in office crowds and a novel device utilizing dynamic digital art to alleviate anxiety. By analyzing captured images from the camera, we can detect and record the sedentary time of office crowds in real-time, effectively identifying potential anxiety symptoms. Subsequently, we design a series of dynamic digital art pieces that stimulate and guide viewers’ sensory experiences through variations in colors and forms to alleviate anxiety. Using a co-constructing story approach, we conducted a user study involving 30 participants to stimulate their imaginations and visions. The results indicate that capturing sedentary behavior in office crowds through cameras and combining it with dynamic digital art as a means to alleviate anxiety significantly reduces anxiety levels among office workers. This research provides an innovative solution to improve the mental well-being of office workers, with potential implications for other related fields of study.