The life that was within him knew that it was the one way out, the way he was predestined to tread.

But he himself did not know anything about it.

He did not know there was any outside at all.
There was one strange thing about this wall of light.

His father (he had already come to recognise his father as the one other dweller in the world, a creature like his mother, who slept near the light and was a bringer of meat)--his father had a way of walking right into the white far wall and disappearing.

The grey cub could not understand this.
Though never permitted by his mother to approach that wall, he had approached the other walls, and encountered hard obstruction on the end of his tender nose.