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2. Smart glass - Wikipedia

   en.wikipedia.org/wiki/Smart_glass

   ICE 3 train with view into driver's cab ICE 3 train with glass panel switched to "frosted" mode. Eureka Tower in Melbourne has a glass cube which projects 3 m (10 ft) out from the building with visitors inside, suspended almost 300 m (984 ft) above the ground. When one enters, the glass is opaque as the cube moves out over the edge of the building.

3. Frosted glass - Wikipedia

   en.wikipedia.org/wiki/Frosted_glass

   Frosted glass is produced by the sandblasting or acid etching of clear sheet glass. This creates a pitted surface on one side of the glass pane and has the effect of rendering the glass translucent by scattering the light which passes through, thus blurring images while still transmitting light.

4. Opacity - Wikipedia

   en.wikipedia.org/wiki/Opacity

   Both mirrors and carbon black are opaque. Opacity depends on the frequency of the light being considered. For instance, some kinds of glass, while transparent in the visual range, are largely opaque to ultraviolet light. More extreme frequency-dependence is visible in the absorption lines of cold gases.

5. Ground glass - Wikipedia

   en.wikipedia.org/wiki/Ground_glass

   Ground or frosted glass is widely used as a weather- and heat-proof light diffuser in ambient lighting, namely on glass covers or enclosures for lamp fixtures, and sometimes on incandescent bulbs. Its functions include reducing glare and preventing retinal damage by direct sight of the lamp filament.

6. Transparency and translucency - Wikipedia

   en.wikipedia.org/wiki/Transparency_and_translucency

   The remaining frequencies (or wavelengths) are free to be reflected or transmitted. This is how colored glass is produced. Most liquids and aqueous solutions are highly transparent. For example, water, cooking oil, rubbing alcohol, air, and natural gas are all clear.

7. Electrochromism - Wikipedia

   en.wikipedia.org/wiki/Electrochromism

   ICE 3 high speed trains use electrochromic glass panels between the passenger compartment and the driver's cabin. The standard mode is clear, and can be switched by the driver to frosted. [ 30 ] Electrochromic windows are used in the Boeing 787 Dreamliner in the form of a dimmable panel between the exterior window and interior dust cover, [ 31 ...