Why the 1930s, you ask? The invention of Penguin paperback books, certainly! This new mass market demanded book covers to become each easy to recognize and straightforward to breed. Science fiction and fantasy book cover use deep blues, purples, and greens. The imagery often consists of magical or sci-fi features https://amazonkindleselfpublishinguk.movie.blog/2025/01/05/tips-to-finalise-the-best-self-publishing-agency/