Visuals play an important part of the presentation of books.
One of the interesting problems is how you handle an author with multiple books.
There are advantages to readers being able to recognize titles from a given authority, but that can also introduce a symmetry which makes the books seems like copies of one another.
I noticed recently that Tor chose to rebrand all the books by Cory Doctorow. I honestly can’t decide if I like the decision or not. I remember the books by their original covers and I like these too.
Here is the catalog of books from Pat Lencioni.
The covers are smaller here but you can see how across the room you can identify his books.
My designer Joy pointed me to Marilynne Robinson’s books and how they have pulled them together. The balance of difference and sameness feels best to me in this series. The typography creates consistency but its placement and the images makes them feel like different books.
So, this is just three examples. Cover consistency is an interesting question because there is no magic answer, but it is interesting to see how different publishers approach it.