The door looks a separation between two places, the one side is bright while the other side is dark. When in the dark, you can see the light. But when in the light, can you see the dark?
This simple thought gives us direction on the kind of decision we make about our life, where does the door lead to?
It is somewhere quite alright, but is it a good place or a bad place. So many doors to open, so many doors to choose from but does it lead somewhere.