[Philip Lelyveld comment: this type of projector with object recognition has been around for years. Its the basis for the Rain Room at LACMA.]
Sony's Future Lab is a research and develop arm of the company that is responsible for taking
outlandish concepts into the prototype phase. A prime example of this was shown at SXSW; the "Interactive Tabletop" that uses depth sensors and motion tracking to know when objects are placed on the table and even bring storybooks to life; Sony programmed its prototype to recognize and interact with a copy of Alice in Wonderland.
When you open the book, it immediately springs to life with animations that can be dragged off the page and then used to interact with a nearby physical objects like a teacup or deck of playing cards. The tabletop also responds to any finger press by tracking the direction of your hand, while hovering your fingers over any portion of the surface highlights the grid of light the projector uses to monitor your movements.