Which psychological principle explains why many thriller novel covers use red or black as dominant colors?

Book covers are more than just protection for pages—they're powerful marketing tools designed to trigger specific psychological responses. From color psychology to typography choices, publishers invest heavily in cover designs that will stand out in both physical and digital marketplaces. This poll tests your knowledge of how product packaging principles specifically apply to the literary world and influence consumer book-buying behavior.

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The Von Restorff Effect (isolation effect), where distinctive items are more likely to be remembered
Color psychology, where red triggers alertness and black signifies mystery and sophistication
The Gestalt Principle of Similarity, where viewers group similar elements to create unified meaning
The Serial Position Effect, where people recall first and last elements in a series better than middle elements