There's some partnership, obviously, involving a book’s inherent recognition and endurance (we'd call this its “vintage” standing) along with the recognizability of its cover, specially its initial cover, if it was done proper, and there can also be a partnership amongst the quality of design by itself and its iconic-ness, https://kindledirectpublishinguk.blogspot.com/2025/01/top-self-publishing-trends-of-2025.html