The authors presented information about the evolving touch technology that they are developing. Finger orientation is being used to determine what a person is looking at and what the user intends to do next. Also, knowing finger orientation allows the user to point. This is then expanded to finger orientation. Allowing the user to flick, "click" different directions, or have gestures greatly expands the range of input possible. The writers also move into inferring user position by figuring out which finger is where on the hand and the angle the hand is held in view. All of this combined with multiple fingers and multiple hands leads to a very complex input device.
This paper is important because it shows just how complex hand and finger recognition is. The continued research in this area will lead to much more user friendly inputs and possibly remove the need for a mouse in the near future. The next step, as the authors said, is to migrate this into a 3D world where tilt can be implemented and 3D gestures can be used, adding another exponential number of possible inputs.
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