"Colorless green ideas sleep furiously" is a sentence composed by Noam Chomsky in his 1957 Syntactic Structures as an example of a sentence that is grammatically correct (logical form) but semantically nonsensical. The term was originally used in his 1955 thesis "Logical Structures of Linguistic Theory". Although the sentence is grammatically correct, no obvious understandable meaning can be derived from it, and thus it demonstrates the distinction between syntax and semantics. As an example of a category mistake, it was used to show inadequacy of the then-popular probabilistic models of grammar, and the need for more structured models.
Read more about Colorless Green Ideas Sleep Furiously: Details, Attempts At Meaningful Interpretations, Statistical Challenges, Related and Similar Examples
Famous quotes containing the words green, ideas and/or sleep:
“The question of whether it’s God’s green earth is not at center stage, except in the sense that if so, one is reminded with some regularity that He may be dying.”
—Edward Hoagland (b. 1932)
“They [creative children] ask more questions than most children. They’re usually spontaneous and enthusiastic. Their ideas are unique and occasionally strike other kids as weird. They’re independent. Not that they don’t care at all what other kids think, but they’re able to do their thing despite the fact that their peers may think it’s strange. And they have lots and lots of ideas.”
—Silvia Rimm (20th century)
“Sweet is the sleep of laborers, whether they eat little or much; but the surfeit of the rich will not let them sleep.”
—Bible: Hebrew, Ecclesiastes 5:12.