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2. Theater drapes and stage curtains - Wikipedia

   en.wikipedia.org/wiki/Theater_drapes_and_stage...

   Traditionally white or natural colored cloth, cycloramas now come in various colors of white, grey, light blue and the green or blue curtains used in Chroma key (greenscreen) work may also be called cycloramas. With projected scenery, cycs and scrims may be used as drops, by employing either front or rear projection.

3. Biological effects of high-energy visible light - Wikipedia

   en.wikipedia.org/wiki/Biological_effects_of_high...

   Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which in artificial narrowband form has a number of proven negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related ...

4. Light curtain - Wikipedia

   en.wikipedia.org/wiki/Light_curtain

   A light curtain is a safety device that detects when a beam of infrared light has been broken by a person passing through an area. Light curtains, now more commonly known as opto-electronic devices, are used to safeguard personnel in the vicinity of moving machinery with the potential to cause harm such as presses , winders and palletisers.

5. Curtain Falls - Wikipedia

   en.wikipedia.org/wiki/Curtain_Falls

   "Curtain Falls" is a song by English boy band Blue. The song was co-written by the band and StarGate, who produced the track. Stevie Wonder is also credited as a writer due to the sampling of his 1976 song "Pastime Paradise". "Curtain Falls" was released on 8 November 2004 as the first single from Blue's first greatest hits album, Best of Blue ...

6. Purkinje effect - Wikipedia

   en.wikipedia.org/wiki/Purkinje_effect

   An animated sequence of simulated appearances of a red flower (of a zonal geranium) and background foliage under photopic, mesopic, and scotopic conditions. The Purkinje effect or Purkinje phenomenon (Czech: [ˈpurkɪɲɛ] ⓘ; sometimes called the Purkinje shift, often pronounced / p ər ˈ k ɪ n dʒ i /) [1] is the tendency for the peak luminance sensitivity of the eye to shift toward the ...

7. Light blue - Wikipedia

   en.wikipedia.org/wiki/Light_blue

   Since the color light blue reminds many people of water, light blue is a popular color for painting bathrooms or for porcelain bathroom fixtures. School colors. Cambridge Blue is a shade of light blue adopted by the University of Cambridge, in contrast with the University of Oxford which has adopted a dark shade of blue (Oxford Blue). Religion