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The upper and lower circles are buttons, the cross is realized as a slider (which works as button as well if you touch shortly). Problem with the Iliad is, that you can't use it blind because you always will trigger it if you try to find out which one it is. In our design, you can feel which one it is and then decide to touch it or to slide. The vertical slider is used to choose a menu, a page turn is realized with a horizontal slide.
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