A vertical streak of light may appear almost like a column.
A bright region may stretch upward or downward.
The edges of a luminous area can become surprisingly distinct.
Against a darker portion of the sky, the contrast can make the effect appear even more solid.
Ice Crystals Can Create Extraordinary Shapes
Tiny ice crystals in the atmosphere can act almost like microscopic optical instruments.
Their shapes and orientations influence the way sunlight travels through them.
When sunlight encounters appropriately shaped ice crystals, the light can be refracted or reflected, producing luminous structures in the sky.
This is part of the physics behind several atmospheric optical phenomena.
A particularly striking example is a sun pillar, in which vertically aligned or plate-like ice crystals can create an elongated column of light appearing above or below the Sun.
Depending on the atmospheric conditions and the observer’s position, such effects can look remarkably dramatic.
The light does not necessarily represent a physical object occupying the space where it appears to be.
It is an optical pattern created by the interaction between sunlight and crystals suspended in the atmosphere.
The Atmosphere Is Never Completely Uniform
Another important factor is that Earth’s atmosphere is constantly changing.
Air near the surface can have a different temperature and density from air above it.
Different layers can move at different speeds and contain different amounts of moisture and particles.
These variations can affect the way light travels.
Over the ocean, this effect can become particularly interesting because the surface of the sea and the air immediately above it can have significant temperature differences.
Warm and cool layers may exist close together, creating conditions in which light from distant objects becomes distorted.
This phenomenon is associated with atmospheric refraction and can sometimes produce mirages or unusual apparent positions.
An object can appear higher, lower, stretched, compressed, or otherwise displaced from where it actually is.
The result can be deeply confusing to an observer.
Why the Sea Makes the Illusion Even More Striking
Ikaria’s location provides a dramatic natural setting for atmospheric optical phenomena.
The island is surrounded by the Aegean Sea, giving observers broad, unobstructed views toward the horizon.
That matters because a clear horizon provides a strong visual reference.
When an unusual light appears against an open sky, there are few nearby objects with which the eye can compare its size or distance.
A bright shape can therefore appear much more substantial than it actually is.
