Apparatus for aiding learning by a person comprises a cover or shield (1) for concealing from the person a part of the person's body, and a webcam (6) and a screen (10) for visually displaying to the person, during concealment of the concealed body part, images of a part of the person's body not in direct view of the person. The apparatus may be used in the learning of a skill, such as hand-writing. In another embodiment, the shield is a collar worn to conceal part of the wearer's body, and the webcam and screen display the concealed body part in real time to the wearer. This apparatus can be used in many applications, such as to learn sports activities or to correct body image, posture or movement.