Which mathematics learning product was pulled from retail shelves in 2014 after selling only 8% of its inventory despite winning educational awards?

In the world of educational products, mathematics tools and resources face unique challenges in retail. Companies must balance educational value with commercial appeal, often leading to interesting product decisions. This poll explores a famous case where a mathematics education product failed in the retail market despite initial excitement and positive reviews. Test your knowledge about this notable retail failure in the mathematics education industry!

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The Geometric Folding Table - a desk that transformed into 3D geometric shapes
NumberSense Calculator - a calculator that deliberately showed estimation errors to teach number approximation
MathVision AR Glasses - augmented reality glasses that displayed math formulas on real-world objects
Equation Balance Scale - physical scales that required proper equation balancing to remain level