Loglan is a constructed language created in the 1950s by James Cooke Brown to test the Sapir-Whorf hypothesis, which suggests that language influences thought. It is designed to be logical and unambiguous, using a grammar that emphasizes clarity and precision. The vocabulary of Loglan is derived from various natural languages, making it accessible to speakers of different linguistic backgrounds. Its structure allows for easy learning and promotes effective communication, aiming to facilitate understanding among people from diverse cultures.