Which publishing innovation is credited with revolutionizing children's book marketing by creating a distinct visual brand identity with color-coded spines that made the books instantly recognizable on shelves?

The publishing industry has undergone massive transformations in how books are marketed and branded. Modern literary promotion often borrows techniques from retail marketing, creating distinctive brand identities for authors and series. This poll tests your knowledge of successful literary branding that changed how books reach audiences and become cultural phenomena.

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Penguin's color-coded genre system
Scholastic's Harry Potter special editions
The Sweet Valley High numbered collection
Goosebumps series with its signature dripping font and neon colors