It would be really helpful if when I mark a book "owned" it could invert colors or turn the same colors as the "to read" button is before it's selected, something like that - something to visually distinguish it as different if I own the book, beyond just having to verbally process reading "mark as owned" vs "owned." Basically I would like a way to be able to more quickly tell at a glance when I'm out and about and pull up the book's page whether I own the book or not.