Which packaging innovation for mathematical learning products was first introduced in 2008 and uses color-coding based on mathematical complexity levels?

In the world of mathematics education products, packaging design plays a crucial role in communicating complexity while maintaining appeal. The right packaging not only protects the product but also conveys its educational value, difficulty level, and target audience. Mathematical product packaging often incorporates specific design elements that reflect the subject matter inside. This trivia question examines a noteworthy innovation in mathematical product packaging that revolutionized how complex concepts are presented to learners.

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The Fibonacci Sequence Packaging System, which uses spiral-shaped containers with sizes that follow the Fibonacci sequence
The Mathematical Taxonomy Index (MTI), which color-codes products from yellow (basic) through blue, green, and red (advanced)
The Geometric Form Factor, which packages products in shapes representing the mathematical concepts they teach
The Pythagoras Method, which uses triangular packaging with dimensions that form perfect right triangles