Answer: It provides a glimpse into the reason that Katherine uses impermanent materials.
Explanation:
The sentence that the last sentence communicated about Katherine's art was that it provides a glimpse into the reason that Katherine uses impermanent materials.
From the last sentence, we can deduce that Katherine's heart was broken and that even though the reason for her broken heart wasn't given. We can also derive the information that anytime the pieces slowly disappeared, she'd feel another piece of her broken heart
dissolve too.