Metaficción refers to a form of fiction that self-consciously addresses the devices of fiction, often blurring the boundary between reality and the fictional world. It invites readers to reflect on the nature of storytelling and its impact on perception. In the context of 'El hijo' by Horacio Quiroga, metaficción can manifest in the way the narrative explores themes of reality versus illusion, highlighting the fragility of life and the power of imagination.