> some error per design

A single minimum error by design would obviously be perfection. And it appears to be a myth story anyways - in truth Islamic carpet weavers do aim for perfection.

I've always thought it would be a catch-22 gotcha rule. Dieties presumably choose to either (A) care about rules or (B) not care about rules. An ambiguous rule is dangerous - especially if intent was what mattered?

The Japanese wabi-sabi is the core behind an equivalent folklore story I heard: https://en.wikipedia.org/wiki/Wabi-sabi