"La vida es sueño" is a famous Spanish play written by Pedro Calderón de la Barca in the 17th century. The story revolves around Segismundo, a prince who is imprisoned by his father, King Basilio, due to a prophecy that he would bring disaster to the kingdom. The play explores themes of reality versus illusion, free will, and the nature of life. As the plot unfolds, Segismundo is released from his prison and experiences the world for the first time. He struggles to understand whether his experiences are real or just a dream. Ultimately, the play suggests that life itself may be a dream, prompting audiences to reflect on their own existence and choices.