Black box repersents death and fear of the unknown. It also symbolizes fate and tradition within the village. As stated in the text lines 58-59, "...No one liked to upset as much tradition as was repersented by the black box." This means the villagers all know what is to come but are too scared to break tradition. To the villagers living in constant fear of death is normal.
Tone and Theme
It's not fair !
In the story "The Lottery" the author sets a beautiful setting for later actions to contrast this. The author paints a bright sunny day in the readers head, speaking of flowers blooming. As seen in lines 2-3 where this is spoken of, "The flowers were blossoming profusely and the grass was richly green." This shows how wonderful the day is suppose to be to the reader.
Repetition: Tessie continues to say it isn't fair. Lines 324 and 230 Tessie exclaims it's not fair. By making her repeat this it shows not everyone is okay with the lottery. She continues to show her distaste for it by saying that "You didn't give him enough time.. it wasnt fair" lines 229-230. The repetition shows the unfair nature of the lottery in the village Tessie lives in.
In the beginning the story was more on the cheerful side because the reader was blissfully unaware of what was going to happen later. The tone towards the end was very panicked and scared. In line 324 Mrs. Hutchinson screams "it isn't fair" Right before she gets stoned to death, this is a shock to the reader. It that the tense tone led up to this happening.