Which mathematical learning tool's sales exploded after its packaging was redesigned from a flat paper map to a more compact, innovative form?

The intersection of mathematics and product design has led to some fascinating innovations in packaging. Geometric principles have revolutionized how products are designed, shipped, and displayed. One particular breakthrough in the 1970s changed how a popular mathematical learning tool was packaged and marketed, dramatically increasing its accessibility and popularity. Test your knowledge about this iconic mathematical product packaging innovation!

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Rubik's Cube, which was originally sold as separate colored blocks with assembly instructions
The slide rule, which was repackaged in a cylindrical tube instead of a flat box
The protractor, which moved from individual packaging to classroom bulk containers
The Möbius strip, when it was folded and packaged as the now-iconic twisted loop design