analogies

• they're both close to the sea
• both of them are connected to each other by different objects
• they're thinking of each other, looking at the sea
• their objects end up in the sea

differences

• she's sitting on a pier, he's on a yacht
• her object is a notebook, his one is a book
• she's writing about him, he's reading about her.
• she throws the bottle voluntary, his wrapping paper flies away