The black box represents death and fear. This is very symbolic throughout the story, this
Tone and Theme
"They tend to gather together quietly for awhile[..]"(line 11). This is perfect imagery for how the kids gather before becoming boisterous. And since it's this is our first instance in which we are given the kids an attribute to their age.
"Lottery in June, corn be heavy soon"(line 198), this is a form of assonance. Assonance is when words that don't usually rhyme are forced to rhyme. This sequence of words don't rhyme at all but, since this is their common saying it is clearing being forced to rhyme.