Why do you think that looking out the window makes Bruno feel very cold and unsafe?

Looking out the window makes Bruno feel cold and unsafe because it starkly contrasts his previous life, reminding him of the warmth and security he once had. The bleak, desolate landscape outside reflects the harsh reality of his new environment and the oppressive atmosphere surrounding him. This sense of isolation and fear is amplified by the unfamiliarity of his surroundings, leaving him feeling vulnerable and alone.