Portal is a virtual reality, museum installation consisting of a moving display and a 3D world. Through head tracking, the display can be moved and the perspective from which the world is rendered can be altered to provide a single-user the experience of peering through a portal into a different world. The gantry that moves the display will be ~8 feet tall with the ability to coarsly follow a user's gaze as they walk around. While the user walks around the display, the scene displayed will also move to provide fine-adjustments and the impression of looking through a window. The current plan for the design of the gantry is to use a chain system to move the display. On the base of the arm there would be a motor that turns the direction that the arc looks in. The 3D worlds are being designed with Unity.