Why do mysterious glowing columns sometimes appear to rise from the frozen ground?
In short: A light pillar is an atmospheric illusion where a vertical beam of light seems to extend from a source, such as the Sun or a streetlight. This striking phenomenon is not a solid beam but a collective reflection off millions of tiny, suspended ice crystals drifting through the cold air.
Light pillars belong to the family of halos, occurring when light interacts with ice crystals in the atmosphere. These crystals are typically flat, hexagonal plates that orient themselves horizontally as they drift downward. As they fall, each flake acts as a miniature mirror, reflecting light from sources positioned below them. Because these crystals exist at varying altitudes, the reflections combine to form a vertical column of light that appears to hover in the sky.
The mechanism behind this effect is purely optical rather than physical. The pillar does not actually exist above or below the light source; it is an illusion created by the specific alignment of crystals in a common vertical plane. Only those crystals positioned to direct light rays toward the observer contribute to the image. This process is analogous to seeing a shimmering line of light on a body of water, where ripples reflect a light source in multiple directions, but only those aimed at the viewer coalesce into a bright, singular line.
While often associated with the Sun—where they are known as solar pillars—these displays can be triggered by the Moon or terrestrial sources like streetlights and volcanic eruptions. The intensity of the pillar depends on the size and quantity of the ice crystals present. In exceptionally cold conditions, these crystals may form near the ground, a phenomenon known as diamond dust. While flat plates are the primary culprits, column-shaped crystals can occasionally produce similar effects, demonstrating how the geometry of frozen water shapes our perception of light.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Light pillar
To cite this card, link to https://intellectplus.co.uk/app/nature-light-pillar.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Air · More in Nature · Latest · A–Z · All topics
