.賴亦德-冬夜幻影—光柱
( Under the Winter Night Skies-light Pillars)

光柱，是一種大氣光學現象，由大氣中的冰晶將幾近平行於地面的光線反射而成。當大氣中有冰晶存在時，就有機會將落入地平線下之太陽的光線反射回地面形成光柱。但在寒冷的北國冬夜，光柱的形成則常是由空氣中的冰晶，將城市裡向上發散的燈光反射回地面而成。這樣的幻象得在氣溫低、空氣中冰晶充足、又不下雪的時候才會出現，可遇不可求。由於城市燈光的色彩多變，和清冷的月光比起來，更讓光柱顯出多樣的色彩。

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Alight pillar is an atmospheric optical phenomenon. It is created by the reflection of light from ice crystals suspended in the atmosphere. If ice crystals are present in the atmosphere, then there is a high chance for them to reflect sunlight that is near or below the horizon back to the ground, to form pillars. But in the cold winter nights of countries far north, light pillars are instead formed when the ice crystals reflect the city lights back to the ground. Such phenomenon will only occur when the temperature is low, with plenty amounts of ice crystals in the air and no chance of snowing. It is highly unpredictable. As most of the cities are filled with an assortment of lights, the pale moonlight will give way to the colorful light pillars.

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