It is hard to judge a book by it’s cover when there are 50 of the same covers in the penguin modern range. To see all the titles and the same cover; click here.
https://www.penguin.co.uk/articles/book-talk/series/penguin-modern/
Penguin was started to make literature cheaper. All the books were paperback and sold for 6 pence in shops like Woolworths. The covers were simple; title in simple font in a band of white across centre of the book. Green covers were for crime stories. Orange for other fiction. Blue for non fiction.
The modern range stays true to the ethos of providing literature cheaply as they are £1 each. I bought 3.