 The characters experience many emotions for the first time during the events of this story.  What emotion(s) push the characters through the door.
When nobody aboard ship remembers where it's going, how can they tell when it has arrived? But ever since the engines somewhere in the rear of the world had changed their tone, from the steady whining Rikud had heard all twenty-five years of his life, to the sullen roar that came to his ears now, the feelings had grown. But something soft had cushioned the impact—something which had come into being just for the moment and then abruptly passed into non-being again, something which was as impalpable as air. The people had decided that they did not know where they were going, or why, and that it was unfair that the elders alone had this authority.
 Hatred and anger.
 Sadness  Hatred and anger.  Excitement and curiosity.  Pure happiness.