Snow against the window pane

I am sure we have all had the experience of taking a photograph that has exceeded our expectations or intentions.  This picture belongs to just such a category.  During the recent snowy weather I sat watching the flakes gust against the window pane and saw them slowly accumulate along the lower edge.  I recognised the potential for a photograph but little expected to capture this polar landscape.  Afterall, the area photographed was approximately 6 inches x 3 inches.