Abracadabra by Chris Harrison is a magnetically driven input approach that makes use of the (larger) space around a (very small) device. The technique provides robust, inexpensive, and wireless input from fingers, without requiring powered external components. By extending the input area to many times the size of the devices screen, our approach is able to offer a high C-D gain, enabling fine motor control. Additionally, screen occlusion can be reduced by moving interaction off of the display and into unused space around the device.

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