This aesthetic choice serves a thematic purpose: Bella sees the world not as it is, but as a playground of wonder. The "weirdness" of the setting normalizes Bella’s own strangeness. In this world of hybrid animals and impossible architecture, a woman with a child's brain doesn't seem out of place—she seems like the most natural thing in it.
“I killed him,” Miss Finch said, and the tent went silent as a held breath. “Not with malice. He had a heart condition. I merely... withheld his medication. He was asleep. He looked peaceful. I took his keys, his money, and his best coat, and I walked to the train station. I have been walking ever since.” Pobres Criaturas