Light pillars are optical phenomena that occur when light reflects off ice crystals suspended in the atmosphere. These vertical columns of light can appear above or below a light source, such as the sun or streetlights, creating a striking visual effect. They are most commonly seen in cold climates where ice crystals are present in the air. The formation of light pillars is influenced by the shape and orientation of the ice crystals, which act like prisms. When the light hits these crystals, it bends and reflects, producing the pillar effect. This phenomenon is often observed during winter months, especially in areas with clear skies and low temperatures.