The Hyperion Cantos are a masterpiece of science fiction, for several reasons. Dan Simmons mingles his own style, nervous and creative, with the romanticism of the great English poet John Keats (eighteenth century). It builds a visionary parable about the risks of technological pride and expands the space opera genre in a story that happens to combine hyper realism to the mythological and religious allegorical. People mentioned, the actions, the worlds traversed form a Dantesque scene in which the reader feels literally immersed. The most impressive is the back and forth between permanent indoor theater tormented personal consciences and gigantic foreign theaters that cross up space and time. These stories are finally glazed puzzles that will be lifted at the end of the reading cycle Endimyon, following Hyperion and The Fall of Hyperion.