The simile draws a parallel between two imagery concepts, allowing the term "what" to link various elements, providing a fresh perspective on the poem. The implication is that time's passing is unavoidable, bringing along the sensation of forgetting. Oblivion accompanies us much like the daily presence of heaven, surfacing in every context.
To start, the narrator is in his study late at night engrossed in his old texts.
Then, he begins to feel sleepy as he hears a knock at the window.
Next, the narrator experiences more fear as the curtains begin to move.
Following that, he is startled by a sound at the window, and a raven enters the room.
<span>Finally, he is astonished to discover no one is present when he opens the door.</span>
