The apparent fact that the number of utterances in a natural language is unbounded is one of its more widely remarked upon properties and a core tenet of modern linguistic theory. The classic argument for creativity uses the idea that one can continually add further adjuncts to sentences to establish that there can be no longest sentence and therefore no finite number of sentences (see Chomsky, 1957). . . .
"This conventional argument for the creativity of natural language is overly strained: who has actually heard a 500-word sentence? In contrast, anyone who studies [natural language] generation has available a far more reasonable and commonsense account of creativity, namely that one continually uses new utterances because one is continually faced with new situations.

Natural language is the embodiment of human cognition and human intelligence. It is very evident that natural language includes an abundance of vague and indefinite phrases and statements that correspond to imprecision in the underlying cognitive concepts. Terms such as 'tall,' 'short,' 'hot,' and 'well' are extremely difficult to translate into knowledge representation, as required for the reasoning systems under discussion. Without such precision, symbolic manipulation within the computer is bleak, to say the least. However, without the richness of meaning inherent in such phrases, human communication would be severely limited, and it is therefore incumbent on us (to attempt) to include such facility within reasoning systems.