What aspect of Chindōgu design separates it from inventions that fail by accident?

Answer

It forces the inventor to consciously engineer failure into the solution.

The genius of Chindōgu is that it formalizes absurdist intention; inventors must deliberately design the failure or impracticality into the solution, unlike accidental failures.

What aspect of Chindōgu design separates it from inventions that fail by accident?
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