In Through the Language Glass, the linguist Guy Deutscher reports that manyprimitive populations, without being color-blind, have verbal designations foronly two or three colors. But when given a simple test, they can successfullymatch strings to their corresponding colors. They are capable of detecting thedifferences between the various nuances of the rainbow, but they do not expressthese in their vocabularies. These populations are culturally, though notbiologically, color-blind