1: an opening in a wall or fence. (Miriam Websters Online Dictionary)
Walls are built to protect us but they are also traps. Walls create shadows where illusions live. Illusions block truth.
A gate won't erode the boundary, it just lets in the light.
A gate lets the prisoner out.
The "gate" was lifted from a window grill photograph out of a collection byArdis Allyn at Picasa.