dream of the lions on the beach

"After that he began to dream of the long yellow beach and he saw the first of the lions come down onto it in the early dark and then the other lions came and he rested his chin on the wood of the bows where the ship lay anchored with the evening off-shore breeze and he waited to see if there would be more lions and he was happy." (#40 812)

"He did not dream of the lions but instead of a vast school of porpoises that stretched for eight or ten miles and it was in the time of their mating and they would leap high into the air and return into the same hole they had made in the water when they leaped." (#40 807)

"He no longer dreamed of storms, nor of women, nor of great occurrences, nor of great fish, nor fights, nor contests of strength, nor of his wife. He only dreamed of places now and of the lions on the beach. They played like young cats in the dusk and he loved them as he loved the boy. He never dreamed about the boy." (#40 212)

Why are the lions the main thing that is left?

"I wish he’d sleep and I could sleep and dream about the lions, he thought. Why are the lions the main thing that is left? Don’t think, old man, he said to himself, Rest gently now against the wood and think of nothing. He is working. Work as little as you can." (#40 648)