Photoelastic elements are formed deliberately with stress concentrations so that, when evaluated with a polariscope, more pronounced isochromatic bands or fringes result when loads are applied to these elements or to assemblies of these elements. A toy for producing color patterns and having polarizing filters coupled to frame elements is disclosed.

 
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> System and method for automatically administering a test, analysing test results and formulating study strategies in response thereto

> Educational tools and methods for demonstrating enhanced performance characteristics of a textile product to a person

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