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The Talking Shadow

Optics & Eye Health

★Exhibit Content: Persistence of Vision ★Interaction: Electromechanical Interaction ★Operation: 1. Press the start button, and the device begins to rotate; 2. Observe the light and shadow phenomenon to understand persistence of vision. ★Exhibit Description: The exhibit mainly consists of a side profile face model, spotlight, drive motor, and other components. It is a recommended exhibit from the PopsciCat Exhibit Store. Children press the start button, and the device starts rotating. Under the illumination of the light, the silhouette of the face on the wall changes dynamically, appearing as if a person is continuously talking. Through this interactive format, users can understand the phenomenon of persistence of vision. ★Scientific Principle: When the human eye sees something, the visual information is converted into light signals and transmitted to the brain nerves. This process takes a brief moment. After the light signal ends, the visual image perceived by the brain does not disappear immediately. This residual vision is called an 'afterimage,' and this phenomenon is known as 'persistence of vision.' Although the silhouette projected on the wall flashes by, it can still be retained in the brain for about 0.1-0.4 seconds, so the face silhouette on the wall appears as if a person is continuously talking.

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Principle Display: ★★★★ Interaction Effect: ★★★ Ease of Installation: ★★★★★ Durability: ★★★★ Overall Rating: ★★★★

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