“The tendency to think in terms of the ‘average man’ is a pitfall into which many persons blunder,” Daniels wrote in 1952. “It is virtually impossible to find an average airman not because of any unique traits in this group but because of the great variability of bodily dimensions which is characteristic of all men.”21 Rather than suggesting that people should strive harder to conform to an artificial ideal of normality, Daniels’s analysis led him to a counterintuitive conclusion that serves as the cornerstone of this book: Any system designed around the average person is doomed to fail.
