Which innovative book cover design technique, introduced in the 1990s, revolutionized the publishing industry by allowing covers to incorporate holographic elements and became particularly popular for literary bestsellers?

Book cover design is a crucial aspect of publishing that blends artistic creativity with marketing strategy. A well-designed cover can significantly impact a book's commercial success, serving as both an artistic statement and a sales tool. This poll tests your knowledge about the evolution and impact of book cover design in the publishing industry.

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Foil stamping with dimensional effects
Die-cut windows revealing interior pages
UV-reactive ink technology
Thermochromic cover treatments