Borges consistently blurs the lines between what is real and what is imagined. In stories like 'Tlön, Uqbar, Orbis Tertius,' a fictional world gradually seeps into our own, questioning the solidity of our perceived reality. This theme is echoed in 'The Circular Ruins,' where a man realizes he himself might be the dream of another.

Labyrinths, both physical and metaphorical, are recurring motifs in 'Ficciones.' The infinite library in 'The Library of Babel' represents the overwhelming vastness of knowledge, where truth becomes elusive and the search for meaning potentially futile.

Borges emphasizes the power of language to shape our understanding of the world. In 'Funes the Memorious,' a man cursed with perfect memory loses his grip on reality, highlighting the necessity of forgetting and generalization for comprehension.