That's right, friends -- in the future, we could be using our real-life keys to open doors, our swords to slice up fools, and our guns (not outside of the US) to shoot up the screen "accidentally." The patent shows off a PlayStation Eye-based system that can recognize 3D objects and use them in-game based on various actions taken by the player -- something Microsoft claims it's Natal is also capable of doing. Various household items will be affected in different ways, the example given being a U-shaped object that, when turned upwards, becomes a sword, versus a U-shaped block when facing downwards (think Halo's Covenant Energy Sword). Apparently the system is able to scan a whole mess of objects and store them in a databank for future use. Like so much future tech we've seen recently, we're taking this one with a full truckload of salt until we get some face time.