Lewis Carroll, in his Phantasmagoria, and Other Poems (1869), constructed a poem that yielded a double acrostic, with the first and last letters of 13 words that were suggested by the 13 stanzas spelling out ‘quasi-insanity commemoration’, a reference to an Oxford commemoration ball. The first stanza, which yields the word quadratic, goes:

‘Yet what are all such gaieties to me/ Whose thoughts are full of indices and surds?

x2 + 7x + 53
= 11 / 3.’