Language is what gives the thought its expression and thus shapes it; in other words, thinking is determined by language. In "Science and Linguistics" Whorf stated that:  According to Whorf, the formulation of ideas and thoughts is not a rational independent process but is determined by particular grammar and vocabulary of the language in which these ideas are expressed. The world around is organized and made sense of through language. Whorf's conclusion was largely based upon a close examination and extensive study of the Hopi Indian language spoken among natives of southwestern North America. During earlier years, Whorf published a number of essays in which he analyzed various linguistic aspects of Hopi. For example, a work called “An American Indian model of the universe” (1936) explores the implications of the Hopi verb system concerning the conception of space and time. In the course of his research, Whorf noticed that Hopi and some other languages (Hebrew, Aztec, and Maya) were built on a different plan from that of English and many other languages which he called SAE (Standard Average European) languages. He discovered several significant features differentiating Hopi from SAE languages that led him to the idea of linguistic determinism. For example, Hopi is a ‘timeless’ language, whose verbal system lacks tenses. Its assessment of time is different from SAE linear temporal view of past, present, and future. This varies with each observer:  Hopi time is non-dimensional and cannot be counted or measured in a way SAE languages measure it, i.e. the Hopi will not say “I stayed six days,” but “I left on the sixth day.” What is crucial in their perception of time is whether an event can be warranted to have occurred, or to be occurring, or to be expected to occur. Hopi grammatical categories signify view of the world as an ongoing process, where time is not divided into fixed segments so that certain things recur, e.g. minutes, evenings, or days. The linguistic structure of SAE languages, on the other hand, gives its speakers a more fixed, objectified and measurable understanding of time and space, where they distinguish between countable and uncountable objects and view time as a linear sequence of past, present, and future. Whorf argues that this and numerous other differences imply a different way of thinking. Since thought is expressed and transmitted through language, it follows that a differently structured language must shape thought along its lines, thus influencing perception.