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Nonsense from WikiPedia:

Nonsense (pronounced /?n?ns?ns/ (UK), /?n?ns?ns/ (US)) is a verbal communication or written text that is spoken or written in a human language or other symbolic system but lacks any coherent meaning. Many poets, novelists and songwriters have used nonsense in their works, often creating entire works using it. It is also an important field of study in cryptography.

The phrase "Colorless green ideas sleep furiously" was coined by Noam Chomsky as an example of nonsense. The individual words make sense and are arranged according to proper grammatical rules, yet the result is nonsense. The inspiration for this attempt at creating verbal nonsense came from the idea of contradiction (for a start, how can a green idea be colorless?) and seemingly irrelevant and/or incompatible characteristics, which conspire to make the phrase meaningless. The phrase "the square root of Tuesday" operates on the latter principle. This principle is behind the inscrutability of the k?an "What is the sound of one hand clapping?", where one hand would presumably be insufficient for clapping without the intervention of another.

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