Crazy things happen when you combine a Kinect with an Oculus Rift, like drawing with your finger in thin air and watching shapes that defy the laws of nature levitate over your living room set. As we can see in this fever dream of a video clip, programmer Matt Guertin has invented a mind-bending 3D drawing tool for virtual reality. The setup he concocted allows him to quickly sketch shapes that are visible from all sides, making a convincing illustration of how virtual reality could one day give all kinds of digital objects and images the same physical dimensions in…