There are two touch pens in this pillar. The top surface of the pillar is an aluminum plate, so it conducts electricity. The touch pens and the aluminum plate are connected by wiring inside, so the Anamorphicons are shown on the iPad while the user is touching the plate, it’s just as if the user is touching the iPad with two fingers. The coordinates of two points on the bottom of the pillar are obtained by an iPad application. The coordinates of the pillar and the rotation angle are obtained relative to them, and the content is provided accordingly.
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