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Float glass itself, invented in the mid-20th century, involves a process where molten glass is floated on molten tin to create a smooth, uniform sheet. The addition of colorants to this process transforms the ordinary into the extraordinary. Colorants, derived from metal oxides, are infused into the molten glass, producing a multitude of hues. Common colorants include cobalt for blue, chromium for green, and manganese for violet. The beauty of coloured float glass lies not only in its vivid colors but also in its ability to interact with light, creating dynamic visual effects that vary throughout the day.

The first big slide took place in a theatre in Paris in the 1790s after the Revolution. After waiting for a few minutes in total darkness with the eerie background music of a glass harmonica, the audience begins to see various shapes appear in the sky, which appear to be light and shadow patterns floating and gliding through the air. These ghosts are pale and lifelike, and can talk, shout, and cry. One of the ghosts is a bleeding nun, first coming closer and then gradually moving away. Later slides involve the ghosts of recently deceased public figures, who are said to have been summoned by the power of science. Because that's how these shows are marketed: it's an intersection between science and religion, faith and enlightenment. They're scary, but they're also hilarious.

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