Which innovative book packaging technique did author Mark Z. Danielewski pioneer in his experimental novel 'House of Leaves' that revolutionized how narrative could be presented?

The publishing industry has evolved tremendously in how books are packaged and presented to readers. From traditional hardcovers to innovative designs that enhance the reading experience, packaging innovations have helped certain books stand out in the crowded literary marketplace. Test your knowledge of groundbreaking book packaging that changed how we interact with literature!

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Color-coded text for different narrators with unconventional page layouts that mirrored the story's content (text appearing upside down, in spirals, or in small boxes)
A book divided into separate booklets in a box, allowing readers to read chapters in any order they choose
Transparent overlay pages that revealed hidden text and images when placed over regular pages
Heat-sensitive ink that revealed additional story content when warmed by the reader's hands