Books

Funny you should ask, I'm just re-doing mine with new shelves.

The books are sorted by genre, then alphabetically by author, except for series, which are in either publication order or correct series order.

So, for example, The Narnia books, publication order:

The Lion, the Witch and the Wardrobe
Prince Caspian
The Voyage of the Dawn Treader
The Silver Chair
The Horse and His Boy
The Magician's Nephew
The Last Battle

Yes, yes, "but Lewis' preferred order..."

https://en.wikipedia.org/wiki/The_Chronicles_of_Narnia

"much of the magic of Narnia comes from the way the world is gradually presented in The Lion, the Witch and the Wardrobe—that the mysterious wardrobe, as a narrative device, is a much better introduction to Narnia than The Magician's Nephew, where the word "Narnia" appears in the first paragraph as something already familiar to the reader. Moreover, they say, it is clear from the texts themselves that The Lion, the Witch and the Wardrobe was intended to be read first. When Aslan is first mentioned in The Lion, the Witch and the Wardrobe, for example, the narrator says that "None of the children knew who Aslan was, any more than you do"—which is nonsensical if one has already read The Magician's Nephew.[26] Other similar textual examples are also cited.[27]"

If you read Magician's Nephew first, you learn things that you should not otherwise know if you go in publication order.

Same with the Doc Smith Lensman books:

Galactic Patrol (1937-1938 / 1950)
Grey Lensman (1939-1940 / 1951)
Second Stage Lensmen (1941-1942 / 1953)
Children of the Lens (1947-1948 / 1954)
Triplanetary (1948)
First Lensman (1950)

The publication dates are decieving because they were originally printed in pulp magazines before being collected as books. As with the Narnia books, reading them chronologically "leaks" the reader information they should not have.

Triplanetary was originally an unrelated story in 1934, it was modified in 1948 to fit the Lensman chronology.

But, OTOH, Stephen King's Dark Tower books are in chronological order:

The Little Sisters of Eluria (1998)
The Gunslinger (1982)
The Drawing of the Three (1987)
The Waste Lands (1991)
Wizard and Glass (1997)
The Wind Through the Keyhole (2012)
Wolves of the Calla (2003)
Song of Susannah (2004)
The Dark Tower (2004)

You don't gain or lose anything reading the proper chronology as with Narnia.

Edit: Also tempted by these cool shelf tags I found on Etsy, but I'm pretty sure I can make my own, cheaper:

https://www.etsy.com/listing/4369077622/book-tavern-signs-handcrafted-bookshelf

https://www.etsy.com/listing/4376754893/vintage-tavern-sign-bookshelf-divider

https://www.etsy.com/listing/4309270493/personalized-wooden-book-shelf-dividers

https://www.etsy.com/listing/4399636750/book-shelf-dividers-set-book-genre