Wii-U allows you to use "peripheral vision" while you play.
I don't know how else to describe this aside from simply amazing. One of the techs, which was indicated in the Wii-U demo from E3 last year, but not talked about much, is the ability to use the tablet’s screen as your peripheral vision.
In the video, you can see the real time demonstration. As a virtual “car” travels down a recreation of a Tokyo street, the user can move the tablet around in 3-D space and get real time video of what they’re seeing from those angles.
Say, for example, that you’re playing a FPS and you’re walking down a narrow corridor with large windows on one side. You could, in effect, keep walking straight down the corridor, but physically turn your body and use the tablet’s screen to look around and observe your environment without deviating from your path.
The second demo in the video is the same Zelda demo we’ve already seen before. While it is impressive, don’t get your hopes up. Much like the infamous GameCube tech demo showcasing Link and Ganondorf fighting, this is merely a tech demo and not an indication of a new Zelda game. Even though a new Zelda game IS assuredly on its way to the Wii-U, it’s unrealistic to hold this demo up as your lofty expectation for what the game will ultimately be.
Overall, though, pretty nifty tech if you ask me!
» Source: http://www.youtube.com/watch?v=S05fWaaATU8
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