Entrance or exit? It depends on which side of the window you find yourself. The window - is the frame of something you could find through it. You can see another story, life, path - it’s your imagination, your fairy tail which starts through the new window right away. Enjoy your adventure.
"While looking through the windows - we open the new world. It does not matter on which side you are, it is important to be able to see outside the window`s frame ..."
While looking through the window everyone sees different, and someone will observe the emptiness... Each may have a look at the window, but not all of them would be able to understand the content, because sometimes it is just important to feel what is necessary, and what is not for your attention.
The window is a transition; this is the way which the light overcomes to penetrate into our space, but for a human it is a showcase where everyone decides by themselves to be an observer, limited with a window frame, or to go beyond it and become a part of the outside space.