Pencil shaped and flat hexagonal ice crystals made of paper and foam are provided for this demonstration.
Scattering and refraction of light by these crystals creates several important natural atmospheric phenomena: (1) The sun pillar is formed by reflections of the sunlight by the flat surfaces of flat crystals when the sun is near the horizon, (2) The 22 degree halo around the moon is formed by refraction with the minimum angle of deviation from pencil ice crystals when the moon is very high in the sky, (3) The sun dog is formed to the side of the sun by refraction from flat ice crystals when the sun is low in the sky.