The subjects were asked to determine whether the distance in colour between chips A
and B was greater than the distance between chips B and C or the other way around. It
turned out that when the borderline between English green and blue went between
chips B and C, the English speakers tended strongly to feel that the distance between
chips B and C was greater than that between chips A and B, even when the actual
distance between chips A and B, as measured independently, was greater. Speakers of
Tarahumara did not make a similar systematic distortion.