To politely paraphrase the film director John Waters: ‘if you go home with somebody, and they don’t have books – leave’.
Which is to say, books are a window into the soul. They’re the bricks that build your knowledge, hopes and personality. To share your shelf is to share yourself – so it stands to reason you would want to show them off properly.
The question is how. Are you the librarian-type, with everything arranged by genre? An alphabet tyrant with nothing out of place? Or more of a slap-dash aesthete who wants to gaze upon a colour-coded rainbow?
To find six of the biggest bookshelf tribes, and what each approach says about you go to the Penguin Blog: https://www.penguin.co.uk/articles/2020/jan/how-to-rearrange-your-bookshelf/