When I play Ligeti’s Étude No. 13: L’escalier du diable / The Devil’s Staircase, I have the feeling of climbing and of Escher’s endless staircases that Ligeti loved so much. I have the feeling not of looking at this famous architectural illusion, but of being part of it, and in vain of looking for an exit. And I feel deeply the existential dimension that this situation had for Ligeti.