I had to once code a ‘wheel of fortune’ UI, that simply revealed trivia in random order. You had the perception of control: you could set a speed for the initial spin and see it gradually stop – as if it was adhering to physical laws – on an item that you haven't seen yet. The same item never came up twice. You always got to see all items on the first try. It was so easy to trick the mind into thinking you had control.
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