Here is one app that you can make good use of to surprise your friends. Appropriately named Invisibility, the app is designed to merge the iPad with its surroundings, so that its only the side bezels that remains visible with a hollow rectangle around it. It really is magical and is outright fun to use.
Here is how the Invisible works:
All that you have to do is take the iPad over any surface that you’d like to make the iPad merge in and take a picture of it with the iPad’s own camera. Next, set the iPad in the exact place that you just took a picture of. Try and make the image to fit with its background. If needed, pinch, pan and rotate the image if necessary, and that’s it. Move the iPad and the app will automatically adjust what’s displayed on the screen in perfect co-ordination with what lies behind the screen. In fact, the coordination is so perfect that it would seem there isn’t any screen at all!
To bring about this effect, the app makes use of the iPad’s built-in sensors like the 3D gyroscope and accelerometers. So when the tablet is moved, the sensors pick up the movement and updates the image accordingly in a manner that matches perfectly with its surrounding, thereby creating an illusion of a transparent screen. The app would work even if the iPad is lifted at one end or is swirled around and the image gets stretched in just the right proportions to ensure the display continues to be in sync with its surrounding.
All in all, a nice fun app that costs just $0.99. It sure reminds one of the famous Invisible Man.