Wow magic props principle

This is a black booth. Although it is transparent, there are many black squares arranged in a diagonal line. Wow has a mezzanine and a card in it, which is also composed of diagonal squares. When the squares of the cards in the mezzanine overlap with the black squares of Wow, you can't see this card, but by pressing the protruding parts of the cards in the mezzanine, you can make them not overlap and you can see the cards in the mezzanine. The slower you press it, the slower it changes.

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