3.  Imagine a group of prisoners chained since birth.
11.  All they hear is echoes and all they see are shadows
9.   The prisoners believe the echoes and shadows to be real.
1.  The prisoners are unable to move their heads.
12. The sounds and shadows are made by people walking on a raised pathway behind the wall.
5.  One day, one of the prisoners is set free.
8.  The prisoners mock him and threaten to kill him.
10. He leaves the cave
6.  He slowly becomes accustomed to the sights of the world outside the cave.
7. His ability to predict the shadows is diminished
4.  He decides to return to the cave.
2.  Gradually, his sight adjusts.