Which innovative packaging design feature was first introduced for mathematics textbooks in the early 2000s that revolutionized how students interact with mathematical content?

The mathematics textbook market has undergone significant transformation in recent decades, with publishers employing various packaging and design strategies to appeal to different educational segments. From vibrant covers appealing to younger students to sophisticated designs for advanced mathematics, packaging plays a crucial role in textbook adoption decisions. Test your knowledge about how mathematics learning tools have been marketed and packaged throughout educational history.

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Augmented reality markers embedded in textbook pages that display 3D mathematical models when scanned with a smartphone
Detachable formula cards with microchip technology that could be inserted into specialized calculators
Heat-sensitive ink that revealed step-by-step solutions when warmed by a student's hand
Magnetic page corners that could automatically bookmark important theorems and examples based on usage patterns