What is a specific detail about the setting in Gathering Blue?

You might want to consider the description we are given of
the community of which Kira is a part, and the way that it features elements that are
both pre- and post-Ruin. This helps to present us with the post-apocalyptic setting that
the novel presents us with. Although the precise nature of the Ruin is never specified,
it is clear that we can link it to some kind of nuclear or environmental disaster that
returned civilisation to its primitive roots. Note how the following quote describes
Kira's community:

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Very little had survived the Ruin, but somehow
the structure called the Council Edifice had remained standing and firm. It was
immeasurably old. Several windows still contained patterned glass of deep reds and
golds, amazing things, for knowledge of the way of making such remarkable glass had been
lost. Some remaining windows, ones in which the colored glass had shattered, were now
paned in a thick, ordinary glass that distorted the view through bubbles and ripples.
Other windows were simply boarded over, and parts of the building's interior were darkly
shadowed. Still, the Edifice was magnificent in comparison to the ordinary sheds and
cottages of the village.

Note
the way that this description makes clear the way that so much knowledge and technology
has been lost. The old church building that is now the Council Edifice boasts forgotten
knowledge through its stained glass windows, and stands in contrast to the "ordinary
sheds and cottages" that the majority of the people in the village live in. This is yet
another detail that the author gives us of the setting that points to the cataclysmic
nature of the Ruin and the way that we are presented with some grim vision of the
future.