A mirror box is a box with a mirror down the center (facing toward a patient's intact limb), invented by Vilayanur S. Ramachandran to help alleviate phantom limb pain, in which patients feel they still have a limb after having it amputated. The wider use of mirrors in this way is known as mirror therapy or mirror visual feedback (MVF). A mirror box is a box with a mirror down the center (facing toward a patient's intact limb), invented by Vilayanur S. Ramachandran to help alleviate phantom limb pain, in which patients feel they still have a limb after having it amputated. The wider use of mirrors in this way is known as mirror therapy or mirror visual feedback (MVF).