Language is more than just a series of words strung together. A sentence must have some essential structure, some system of rules governing words and clauses–a grammar. You don’t have to be Strunk or White to recognize this system at work; it’s automatic in the brain. In Noam Chomsky’s famous example, people know that the meaningless sentence “colorless green ideas sleep furiously” is grammatically correct the very first time they see it. Article continues at fastcodesign.com