Levity Novelty have debuted an iPad app for the iPad 2 simply called Invisibility that simulates invisibility of the iPad screen on a table or other environment even as the device is in motion, using a combination of the iPad 2's abilities in concert in a clever new way. By combining a previously-taken picture of the table with the iPad 2's 3D gyroscope, high-res photography and accelerometers, the iPad's screen will seem to disappear.
