In 1950, Spanish American novelists were tolerated but marginal in the literary landscape, with Paris and New York representing the center of the literary world; by 1975 they were celebrated as central figures. As well as being a publishing phenomenon, the Boom introduced a series of novel aesthetic and stylistic features to world literature. In general—and considering there are many countries and hundreds of important authors—at the start of the period, Realism prevails, with novels tinged by an existentialist pessimism, with well-rounded characters lamenting their destinies, and a straightforward narrative line. In the 1960s, language loosens up, gets hip, pop, streetwise, characters are much more complex, and the chronology becomes intricate, making of the reader an active participant in the deciphering of the text. Late in the period the political adventure goes sour, while the linguistic sophistication reaches a new height, and novelists turn more to a reflection on their own writing, a fiction on fiction or metafiction, while characters and story lines show the corrosive power of a postmodern society, where all is equally available and insignificant.