How windows can go from clear to opaque with the flip off a switch?
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When I was a kid, there was a primitive kind of electronic game that used LCD displays capable of effectively 1 color. The display was transparent, but had sections that, if powered, would turn black. That mechanism was placed over a sticker, so you could play a baseball game and pre-stamped parts of the display would light up to show you what players were on base, etc.
That’s also how you can make a window that can change its tint. They’ve got a film with that kind of display on it. When there is no electricity, it’s transparent and you can see through the window. When a certain voltage is applied, the film turns dark and you can’t see through it. Depending on how it’s made, you might be able to apply partial voltage and let *some* light through: this lets you “dim” the tint.
As far as I can tell it’s pretty expensive, but it definitely looks cool.
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