demise of windows --
broken glass, boarded up, bricked,
The decline of windows is one sign of an urban area in decline. A glass pane gets broken by storm or a thrown rock and, rather than being repaired, it gets boarded up. The window in a room no longer in use gets filled with bricks or a corrugated metal panel. A basement window at street level gets plastered over to prevent access. What was once open, allowing the passage of light, now remains closed. In time, weather will warp the wood, crumble the bricks, rust the metal, erode the plaster. Then light will move freely through the open windows once more.