There is an ominous tone that is set by the box's presence. It creates mystery and tension as the reader doesn't know it's significants. This is seen in the quote "villagers kept their distance, leaving space between them and the stool". The villagers know that the box is bad and thus stay away from it.
This represents warmth and excitement in the story because of how the setting is described. It's described as "clear and sunny, with the fresh warmth of a full summer day" and "Flowers were blooming profusely".
Horror is seen here, as the fate of the women is set. with the context clues you can infer that the women is being stoned to death. This is shown in the quote "It isn't fair, A stone hit her in the side of the head".
The box represents the lottery in the story. It is shown to have great signficants to the town for being so old and holding the past of the town. In the story the box is used to pick the lottery winner within the town.
In the story they use imagery to create a clear picture of the town early on. They use terms such as "clear and sunny, with the fresh warmth of a full summer day" and "Flowers were blooming profusely" to describe a very bright and sunny day that radiates good vibes.
The black box/ paper with the dot on it could be used as a metaphor for death. This is because whoever has the paper eventually gets killed.