"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:
“People in America, of course, live in all sorts of fashions, because they are foreigners, or unlucky, or depraved, or without ambition; people live like that, but Americans live in white detached houses with green shutters. Rigidly, blindly, the dream takes precedence.”
—Margaret Mead (1901–1978)
“People find ideas a bore because they do not distinguish between live ones and stuffed ones on a shelf.”
—Ezra Pound (1885–1972)
“Pollicle dogs and cats all must
Jellicle cats and dogs all must
Like undertakers, come to dust.
Here a little dog I pause
Heaving up my prior paws,
Pause, and sleep endlessly.”
—T.S. (Thomas Stearns)