A light pillar is a visual phenomenon created by the reflection of light from ice crystals with near
horizontal parallel planar surfaces. The light can come from the sun (usually at or low to the
horizon) in which case the phenomenon is called a sun pillar or solar pillar. It can also come from
the moon or from terrestrial sources such as streetlights. (from the Wikipedia)

Photographed near Carleton Place, Ontario, Canada.
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