The fence represents the blockage that Troy's carrier went through,and the racism that pushed him to not let his son go for his own dreams.
The fence symbolizes in the beginning of the story the containment of the relationship between father and son and their close bond on the "inside of the fence". Then at the end the fence symbolizes...
Its just an illusion, you cant actually stack them. They are just placed at the correct angle to make it look like they are stacked.
A pedestrian is some one that walks on foot. My mommy said so.
Walk.