Final answer:
Hemingway's use of language and imagery contrast the inside and outside of a hotel room to evoke a mood of gloominess and depression, conveying a strong sense of melancholy and desolation in the setting.
Step-by-step explanation:
In the first sentence, Hemingway contrasts the inside and outside of the hotel room to create a mood of gloominess and depression. This effect is achieved through the use of language that evokes feelings of darkness, decay, and desolation. The detailed description of the setting, with words like 'vacant eye-like windows' and 'bleak walls', contribute to this somber mood.
The mention of the 'opium' dream adds a layer of melancholy and suggests a sense of struggle or discomfort with reality. Hemingway's choice of words and imagery effectively creates a backdrop that is stark and emotionally provocative, further reinforced by his minimalist style.