 Recursion describes a repetition of a linguistic element or grammatical structure in sequence. The recursive property of language enables its grammar to produce an infinite number of sentences. In other words, there is no upper limit to the possible sentences that a speaker of a language can create. Recursion can occur in adjectival phrases, prepositional phrases, or sentence coordination. Take for instance this quote from Louis Saccar's book, Holes. It was all because of his no good dirty rotten pig stealing great great grandfather. The string of adjectives modifying the noun grandfather is an example of a recursive structure. According to the rule of generative grammar, an adjectival phrase may consist of an adjective and another adjectival phrase. That adjectival phrase can consist of an adjective and yet another adjectival phrase. The rule can be applied over and over and over to create grammatically boundless possibilities. Prepositional phrases also lend themselves to recursion. Jack can be sitting on the chair at the table in the house by the park in the town with the garden next to the lake and so on. Similarly, on the level of sentence coordination, I can think that you think that he thinks that she thinks that they think that we think that linguistics is great.