Problem: The gap between performance in the world and a simulation is familiar to most computer users. In the real world, the placement, orientation, and scaling of a rectangle can be indicated in one quick gesture using the thumb and index fingers of both hands, and a rubber band to mark the perimeter. In a simulation (e.g., MacDraw) the same process must be performed in three steps using a mouse, requiring about 10 times longer. A similar gap exists in VEs, both in terms of physical realism and task performance. For example, the phrase virtual reality typically conjures an image of a user with one passive VR glove that senses joint angles of a few fingers and the position/orientation of the hand, through which the user can convey his or her intentions.