you make a better door than a window

You make a better door than a window is a phrase which refers to someone who is standing directly in front of you and in your way. This is somewhat of a more polite way to ask someone to move aside whether because you are trying to see something, or because you need to get past them. It refers to a door as in that you cant see through a door, but you would be able to see through them if they were a window.