Mirrоr therаpy is а rehаbilitatiоn technique using a mirrоr to create a visual illusion of movement in an affected or missing limb, tricking the brain into reducing pain and improving mobility. This works by using a mirror in the patient's midline, blocking the view of the affected limb. The patient moves their unaffected limb while watching its reflection, making it appear as though the affected limb is moving normally. See an image of this below. Erin wants to make a similar illusion in VR, enabling the movements of one arm to seen as moving the other arm. For this type of setup, a head-mounted display system would be preferable over an immersive display system (e.g. CAVE) as a participant's body be more easily obscured.