The black box in a symbol because of what it is used for in the story. Having everyone pull a paper to see if they are the ones to die that day or now is really creepy. But that's what the box is used for so its a huge part of the story.
Tone and Theme
"flowers were blossoming profusely and the grass was richy green" that is lines 2 and 3. This was chosen as an image because you can just picture it in your head all day long. Just seeing the field of flowers on the outskirts of town that everyone lives in.
Ad hominem - "you didn't give him time enough to take any paper he wanted. I saw you. It wasn't fair." She is arguing for her husband who has to be killed because she thinks he wasn't given a fair amount of time to get his paper. So she tries to fight for him cause he was treated unfairly due to the Mr. summers.
They all have worried faces because nobody knows who will die that day. they all have papers an one has a dot an who ever has the dot dies. So everyone freaks out till they know that they don't die that day but don't know if they will tomorrow.