Darkness
The imagery of darkness is a constant occurrence in the novel. Darkness is connected to death, it is terrifying at first, but then comforting. Ursula has to go through the darkness to see light once again. It is crucial to the cycle of life and death.
Memories
As she lives the same life over and over again, Ursula begins to have unexplainable memories of things that, logically, never happened. These memories are from the previous lives, and they guide her in the next ones, enabling her to foresee danger, but also dubbing her as an outcast of her family. At the end, Ursula is able to remember her previous lives entirely, make every right decision to reach her final goal.
War
The imagery of war is strong in the novel as there is a huge part of it taking place during the war. Ursula experiences the war first-hand in Germany, the frenzy and sheep-like obedience to the cause, after which disaster strikes, and fear for one's life, starvation, cold and sickness, destruction, rubble, and death. In one of the following lives, she works as a rescuer of bombing victims and comes face to face with the complete destruction of cities and human lives.