Helsinki: A colourful sun dog (parhelion), a halo phenomenon caused by refraction of sunlight by ice crystals, glowing above the South Harbour on a freezing winter day. Photo taken from the shore of Katajanokka district towards the islands of Ryssänsaari, Suomenlinna and Valkosaari. The ship on the left is Viking Line's m/s Mariella, which is berthed at its quay.