Boredom to Juliet is just a failure of her imagination. She experiences it often; being stuck in the house and having no friends means she often finds herself in this state. She has her art, but again; failure of her imagination. Reading was her next option, but everything she picks up leaves her mind wondering again.
Her dad and both her uncles are nowhere to be seen. Her father at some meeting in California and Stefan was out hunting... and she has no idea where Damon is. She hasn't seen him in nearly a year, which isn't unusual but leaves her with a dearth of people to entertain herself with.
The house is big and empty and Juliet decides to explore. She begins her exploration at the one place she has mostly avoided for the majority of her life: Damon's room. She's been in it before... but never really dared to spend a lot of time there. Damon was scary when he wanted to be, probably always, really. But. She's so bored and Damon wasn't here.
The door is locked, but Juliet has many skills and manages to pick the lock in not-quite record time. Another skill born from boredom. She steps into the room and locks it again behind her. Just in case.
She takes her time investigating the room, picking up random things and books. He has a lot of old things, which is kind of predictable. He is Very Old.
She finds one of Stefan's old journals on a shelf and spends some time giggling over the melancholic words inside.
Eventually, she unveils a large mirror hidden under a white sheet. Which is unusual since Damon is quite vain, so covering up mirrors seems very out of character.
The mirror is beautiful. Intricate and very much an antique.
Her reflection stares back at her, framed by the room behind her. If slightly distorted...
She reaches out and touches it.