A Strange Sweeping

I have mentioned that this cottage as aligned on the four cardinal points of the compass and so has walls facing north, south, east and west.  But in the winter months the daylight does not penetrate the house at all; it gets no nearer than about 200 yards away.  Previous owners have installed partly-glazed doors to make the most of the midsummer light when the evening sun can reach the hearth-wall in the heart of the house, and the result is a corridor of glass doors.  Today I must be sitting differently, for with recent leaf-loss and hedge trimming I can see headlights sweeping the shadows of the beech branches onto the front of the house.  The cars are probably a mile away as the crow flies.  I have not noticed this before.