Just a simple old-time window in an old-time farm shed. Weathered brick, broken glass. The contrast between wall and window is a beginning, then the glass in the window is so dirty that you can hardly see through it. However, the glass is broken so you can see through it—but all you see is the dark inside of the shed, so it's just blackness.
To make it a little more lively, I took this picture with the wall somewhat in perspective. The lines of mortar give a little bit of movement, leading the eye towards the broken window.