To think of going over the moor in the daylight, and when the sky was blue!

想想吧，在白天，在蓝天底下，走过荒原！

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To get the blue daylight, I used the Mental Ray day light System and a Sky light Portal.

为了产生蓝色的日光，我使用了金属射线日光系统和天空光。

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Blue wavelengths-which are beneficial during daylight hours because they boost attention, reaction times, and mood-seem to be the most disruptive at night.

蓝光波长-在白天是有益的，因为他们可以帮助提高注意力，提升反应时间，改善心情-这些在夜间似乎是具有破坏性的。

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The pictures come from the Visible Infrared Imaging Radiometer Suite (VIIRS) satellite, and have been referred to as "The Black Marble" in reference to the famous "Blue Marble" daylight pictures.

ENGADGET: Alt-week 12.08.12: The oldest known dinosaur, lighting up a space station and the black marble

While some gems may appear colorless in daylight, under ultraviolet light they can burn a bright blue or green.

FORBES: Cindy Chao's Butterfly Brooch Added to Smithsonian Gem Hall

The curtainless windows were rectangles of electric-blue sky that turned to gray and then normal daylight as the patients rose and slowly, in their thin striped cotton robes, began wandering down the corridor that led into the common room.

NEWYORKER: The Reptile Garden