The disappearing track

The exhibit the unique optical refraction phenomenon of objects disappearing through electromechanical interaction.

Interaction type: Electromechanical, hands-on. The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

Through a technique, a set of strip-shaped objects that appear identical to the observer will disappear when immersed in a crystal clear liquid. Only one rod (made of glass) in the middle can still be recognized by the observer. The 'disappearing' rod has the same refractive index as the liquid, so it is no longer visible. Set up a sealed container for the exhibit, with a self chain lifting device inside the container. The small ball orbit (with the same optical density as the liquid), probability distribution, celestial motion, etc., allow visitors to understand the optical density.