the.com/quality
The invisible thing you only notice the second it's missing.
means The standard or degree of how good or bad something is, or a distinctive characteristic that defines what something is like.
from From Latin qualitas, which the philosopher Cicero is credited with coining to translate the Greek poiotes — literally 'of-what-kind-ness' — when he needed a Latin word for the abstract idea of 'what something is like.' It reached English through Old French qualite, carrying both senses we still juggle: an inherent trait, and a measure of excellence.
Pirsig's questA philosopher chased its definition into a breakdown
Toyota's edgeBuilt empires by letting workers stop the line
Latin rootFrom qualis, meaning what kind of thing
Costs nothingCrosby argued defects, not standards, drain the budget