Parallax Dog (2021) is a video mapping work exploring the Parallax technique to create 3D optical illusions. The moving object (dog) functions as a Z-axis reference for the audience to experience the "depth effect." This work aims to be displayed on a building and uses its architectural surface as a canvas to create the optical illusion. Audio-reactive methods are applied to synchronize visual and music where all the changes are manipulated in real-time by the audio data.