The phone detects the kind of lighting in use at the user's location-such as fluorescent, incandescent, and natural lighting-and automatically adjusts the screen's color balance to the optimal setting.

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So, this approach requires one more layer of effort: converting the height map (or at least its visible tiles) into a "normal map" which is smooth and natural enough to be subjected to lighting effects and then displayed on screen.

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About 93 percent of 3, 040 large U.S. hospitals used one or more day lighting or lighting conservation features, including tinted window glass (80 percent), reflective window glass (39 percent), external overhangs or awnings (47 percent), skylights or atriums designed to provide light (57 percent), automatic controls or sensors that increase or reduce lighting in response to the level of natural light (14 percent), and occupancy sensors that reduce lighting when rooms are unoccupied (46 percent).

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Living and sleeping spaces circumnavigate the circular plan to provide copious natural lighting.

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Case in point: a scene from the upcoming documentary Gasland, which features a man lighting his faucet water on fire and making the ridiculous claim that natural gas drilling is responsible for the incident.

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The indoor lighting levels in their enclosures now simulate those of natural light levels, in line with sunrise and sunset.

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