Reality is not what it was. Augmented
reality (AR) can enhance our
perceptions of the real environment by
overlaying images of it with sensory
input such as sound, graphical overlays,
video and various other types of data.
Technology can also simulate our
physical presence in virtual reality (VR)
worlds where we can interact online:
some of our experiences of virtual
worlds can be largely visual and aural
with simple interfaces such as keyboard,
mouse and headphones, or they can be
much more immersive, using devices
such as wired gloves and headmounted
displays to overlay and
augment our perceptions.