Being able to roam free across the moors best illustrates the wildness of Catherine and Heathcliff's natures. This rough freedom of Wuthering Heights contrasts with the dignified calmness of Thrushcross Grange. Similarly, the Linton children (safe, spoiled, and cowardly) serve as a contrast to Catherine and Heathcliff (self-willed, strong, and rebellious).
For the first time, a difference between Catherine and Heathcliff is revealed: She is drawn to the civility and luxury present there whereas he is repulsed by it. Ironically, Heathcliff is once again an outsider, meeting with rejection. Heathcliff will never be a welcome presence at Thrushcross Grange, but Catherine will always be treated as royalty.
Within Nelly's narration, the events that transpired at Thrushcross Grange are told from Heathcliff's point of view. He immediately dislikes the Lintons and what they represent, plus they now have what he cherishes most, namely Catherine. Therefore, the narrative once again becomes slightly suspect. Perhaps things occurred exactly as Heathcliff relates them or perhaps he paints a slightly skewed picture.
This chapter marks the first significant change in Catherine's character. She experiences a whole new world at Thrushcross Grange, a world that will not and cannot contain Heathcliff. Gradually the change in Catherine will lead to a change in the relationship between Catherine and Heathcliff, whether she wants it to or not.
