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 head- mounted displays to overlay and augment our perceptions.