This paper proposes an interactive artwork to visualize the internal conflicts of an individual reacting to environmental impulses. This artwork is implemented using an enhanced particle dynamics simulation method with pre-integrated volume rendering. The computational efficiency is achieved using small number of particles for representing a significant volume. In this artwork, the viewer in front of a video camera touches a pair of columns on which arrays of sensors are located to serve as virtual fluid injectors. The sensor signal and the video image are transmitted to the computer and the video processor, and the computer simulates particle fluids being virtually injected into the shadow of the viewer. The processed shadows and the computer rendered images are then superposed to create a visual illusion that appears as if the fluid is injected into the body and then reacts to diverse body postures accordingly, associating the mental functions of ego.