A 3D computer generated image from the monitor at the top is reflected by a mirror to the subject whose finger is wired with sensors and is located below the image plane. The subject wears 3D glasses.

Humans use their hands for many everyday tasks. The study and analysis of goal-directed human hand movement is an interesting area of study in its own right, but it is becoming an increasingly important topic in the field of human-computer interaction (HCI) because of the growing popularity of 2-D graphical user interfaces (GUIs) and more recently 3-D virtual reality systems (VR), where gestural input and full hand pointing are being explored as the input technique of choice for future computer systems and for telerobotic systems used in some advanced manufacturing applications.