Daniel L. Everett's 2005 article in Current Anthropology challenges the universal design features of human language by examining the Pirahã language and culture. Everett argues that Pirahã grammar is constrained by its culture, which limits communication to immediate, non-abstract experiences. This cultural constraint leads to the absence of certain linguistic features such as numbers, color terms, embedding, and relative tenses. The Pirahã language lacks a concept of counting, has no color terms, and uses a simple pronoun system. It also has a minimal kinship system and no creation myths or long-term memory. The Pirahã are monolingual despite over 200 years of contact with non-Pirahã people. Everett suggests that cultural constraints on grammar and cognition are significant, and that the Pirahã language reflects a unique cultural perspective on communication. The article also discusses the absence of quantifier terms and the lack of a system for expressing abstract concepts. Everett argues that the Pirahã language and culture challenge the idea that language determines thought, and that cultural constraints on grammar and cognition are important for understanding language and culture. The article also discusses the absence of color terms in Pirahã and the implications for linguistic relativity. Everett concludes that the Pirahã language and culture provide important insights into the relationship between language and culture, and that cultural constraints on grammar and cognition are significant for understanding language and culture.Daniel L. Everett's 2005 article in Current Anthropology challenges the universal design features of human language by examining the Pirahã language and culture. Everett argues that Pirahã grammar is constrained by its culture, which limits communication to immediate, non-abstract experiences. This cultural constraint leads to the absence of certain linguistic features such as numbers, color terms, embedding, and relative tenses. The Pirahã language lacks a concept of counting, has no color terms, and uses a simple pronoun system. It also has a minimal kinship system and no creation myths or long-term memory. The Pirahã are monolingual despite over 200 years of contact with non-Pirahã people. Everett suggests that cultural constraints on grammar and cognition are significant, and that the Pirahã language reflects a unique cultural perspective on communication. The article also discusses the absence of quantifier terms and the lack of a system for expressing abstract concepts. Everett argues that the Pirahã language and culture challenge the idea that language determines thought, and that cultural constraints on grammar and cognition are important for understanding language and culture. The article also discusses the absence of color terms in Pirahã and the implications for linguistic relativity. Everett concludes that the Pirahã language and culture provide important insights into the relationship between language and culture, and that cultural constraints on grammar and cognition are significant for understanding language and culture.