Context

Stein wrote this line in her 1913 poem "Sacred Emily," published in the 1922 collection Geography and Plays; the first, capitalized "Rose" is the name of a person. She later told an Oxford audience that in that line "the rose is red for the first time in English poetry for a hundred years" — meaning a word worn smooth by centuries of poetic use had been made to mean again. The shortened form, "A rose is a rose is a rose," became one of the most quoted sentences in modernist literature.

How the repetition works

Diacope — broad-form epizeuxis with a short connective (here, “and” or “the”) between the repeated words. About this distinction →

Every other entry in this catalogue uses repetition to raise emotional pitch — grief, shock, command, reverence. Stein's does the opposite: the recurring "rose," separated only by the connective "is a," asserts the law of identity (A is A), so the figure performs tautology rather than feeling. The instructive point is that adjacent repetition can also restore force to a word emptied by overuse — by the fourth "rose," Stein argued, the noun has been scrubbed back to the thing itself, naming the flower rather than the accumulated cliche.