1. Focuses on imagination
This applies to Wuthering Heights where Cathy becomes "mad" and starts seeing things like the Heights off in the distance, whereas Nelly sees no such thing. The story pays attention to Cathy's hallucinatory sights, which pertains to the element of imagination, as the images are from Cathy's brain.
2. Common man
Cathy cannot marry Heathcliff because he is too much of a common man and therefore it would be below her to marry him. The whole problem of the novel is that Cathy loves Heathcliff but cannot marry him because he is a common man and instead marries Edgar and cannot go back on her marriage.