Cold winter night at the office

I took this 2 pictures after a long day of work.

I have always been fascinated by the colors that brings the winter nights, this particular contrast between yellow and black it really touches me.

Camera: Iphone 5. Friday, december 13 2013, 6:10 pm. L'Orme des mérisiers, LSCE-CEA Gif Sur Yvette. Ile de France.