If I were to sit here long enough I would see that light, and the open music book (Schumann, "Forest Scenes") it illuminates, fade away. In its place, the cloudy day outside.
It's not unlike a church at night, stained glass windows gleaming into the void. Dark on the inside without the sun to flood through them.
From 7 p.m. to 7 a.m. we see ourselves; from 7 a.m. to 7 p.m. we see the world. At this time of year an equal measure of both.