Shklovsky contributed two of their most well-known concepts: defamiliarization (ostraneniye, more literally, 'estrangement') and the plot/story distinction (syuzhet/fabula). "Defamiliarization" is one of the crucial ways in which literary language distinguishes itself from ordinary, communicative language, and is a feature of how art in general works, namely by presenting the world in a strange and new way that allows us to see things differently. Innovation in literary history is, according to Shklovsky, partly a matter of finding new techniques of defamiliarization. The plot/story distinction separates out the sequence of events the work relates (the story) from the sequence in which those events are presented in the work (the plot). Both of these concepts are attempts to describe the significance of the form of a literary work in order to define its "literariness." For the Russian Formalists as a whole, form is what makes something art to begin with, so in order to understand a work of art as a work of art (rather than as an ornamented communicative act) one must focus on its form. This emphasis on form, seemingly at the expense of thematic content, was not well-received after the Russian Revolution of 1917. One of the most sophisticated critiques of the Formalist project was Leon Trotsky's Literature and Revolution (1924). Trotsky does not wholly dismiss the Formalist approach, but insists that "the methods of formal analysis are necessary, but insufficient" because they neglect the social world with which the human beings who write and read literature are bound up: "The form of art is, to a certain and very large degree, independent, but the artist who creates this form, and the spectator who is enjoying it, are not empty machines, one for creating form and the other for appreciating it. They are living people, with a crystallized psychology representing a certain unity, even if not entirely harmonious. This psychology is the result of social conditions" (180, 171). The Formalists were thus accused of being politically reactionary because of such unpatriotic remarks as Shklovsky's (quoted by Trotsky) that "Art was always free of life, and its color never reflected the color of the flag which waved over the fortress of the City"(source?)(164). The leaders of the movement suffered political persecution beginning in the 1920s, when Joseph Stalin came to power, which largely put an end to their inquiries. But their ideas continued to influence subsequent thinkers, partly due to Tzvetan