Abstract: A system in accordance with the invention includes an interactive video system that creates immersive multimedia experiences through responsive physical interaction and audience participation. The system transform floors, walls, screens, staging and other surfaces and video output devices into an interactive experience. Motion tracking and projection systems enable the combination of a background message to be manipulated in response to audience participation, including human body movements. Included within the system is a software application with a setup and programming user interface, used in conjunction with external hardware to which it is connected. External hardware includes, in one basic embodiment, one or more video projectors, one or more video cameras, and one or more computers. The computer receives input from the video cameras, and modifies the projected video based upon that input. A single system unit can be networked to other system units on a LAN, WAN, or global network.