There are some crazy ideas here. I really like the fiber optic pass through for object detection. I still think RFID would be a better solution since you have to uniquely identify each element and teach your program to know that object. Although the gradient tags give you orientation.
Madgets are transparent tangible controls for multi-touch tables. Our system combines electromagnetic actuation with fiber optical tracking.
For more information: Visit hci.rwth-aachen.de/madgets
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