Helmer Osslund’s sensitive eye for nature’s colours is especially pronounced in his paintings that specifically portray the seasons. In Sommarafton vid Kallsjön the evening sun casts a subtle pink tone on the landscape, making the snow part of summer instead of a residue of winter. The portrayal appears intentionally subdued and, together with the tranquil water surface, gives the scene a peaceful quality that successfully conveys the magic of Nordic summer nights.