A method is performed in a virtual-reality system that includes a head-mounted display (HMD) and a hand-held controller. The hand-held controller includes a grip and a user-input key mounted at least in part on the grip. In the method, an image of a hand is displayed on the HMD. Pressure applied to the user-input key by a user holding the hand-held controller and wearing the HMD is sensed. A degree of closing of the image of the hand is displayed on the HMD in proportion to the pressure applied to the grip.