Edit a bookshelf without treating every book as decoration
A bookshelf can serve a reading life without asking every book to justify its decorative value.
Books do not all need to be beautiful objects. A worn paperback with notes in the margins may be more important to its owner than a coordinated row of handsome hardbacks. When a shelf becomes crowded, begin with the relationship to the books rather than their colors or the photograph you hope the shelf will resemble.
Take one section at a time and look for the books you actively use, expect to reread, or genuinely value. Reference books can deserve space even if they are opened infrequently. A novel kept only because you feel you ought to enjoy it may be a different decision. You do not have to apply the same rule to every kind of book.
Condition matters, too. Separate damp, moldy, or pest-affected material from the rest and seek appropriate conservation guidance for anything valuable. Ordinary dusting and tidying should not become an improvised treatment for a damaged or significant volume. Avoid storing books against a damp wall or in direct, prolonged sunlight.
A useful shelf arrangement follows how you remember a title. That may mean subject, author, series, or a few broad groups. Arranging by color is a visual choice, but it can make retrieval harder if you remember the subject and not the spine. There is no need to borrow a library's entire system for a single household bookcase.
Leave enough clearance to remove a book without pulling hard at the top of its spine. Support rows so they do not lean heavily, and avoid placing a tall unstable stack where it can fall. Heavy volumes belong on shelves that can support them; check the furniture's capacity rather than filling every available inch.
Books being read now can have a small separate place near the usual reading seat. This keeps the main shelf from absorbing unfinished reading piles, while making it easy to return completed books. Limit the current-reading area to what you can comfortably see and handle.
If you choose to pass books on, check what a local library, charity, school, or resale service actually accepts before delivering them. An unwanted book is not automatically a useful donation. Some books may be better recycled through an appropriate local option.
A little open space can make a shelf easier to use, but it is not a moral achievement. Keep the books that support your life, give them sound physical support, and let the arrangement be recognizable to you. A reader's bookcase is allowed to look as though reading happens there.