Photographs record light. But there are different ways to do that. And apparently a new technology is able to record more information about the light in a scene: color, intensity and also vector direction of the rays. This means, among others elements, that pictures will not be a given and fixed data any more. You will be able to change focus, perspective and to shift from 2D to 3D AFTER having taken the photo.
A new, very interesting on line tool. I quote from the homepage:
www.camera-obscura.org is a digital library on the history photographic techniques. Several thousand books public domain will be available soon online for free with the possibility of advanced research directly in the book content.