Sentence:  In the calm which follows the reading of a poem , for example , <WSD>is</WSD> the effect produced by the enforced quiet , by the musical quality of words and rhythm , by the sentiments or sense of the poem , by the associations with earlier readings , if it is familiar , by the boost to the self-esteem for the semi-literate , by the diversion of attention , by the sense of security in a legitimized withdrawal , by a kind license for some variety of fantasy life regarded as forbidden , or by half conscious ideas about the magical power of words ? 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)