In his collection Seven Nights (1984), Jorge Luis Borges wrote:

I have two nightmares that often become confused with each other. I have the nightmare of the labyrinth, which comes, in part, from a steel engraving I saw in a French book when I was a child. In this engraving were the Seven Wonders of the World, among them the labyrinth of Crete. I believed when I was a child (or I now believe I believed) that if one had a magnifying glass powerful enough, one could look through he cracks and see the Minotaur in the terrible center of the labyrinth. My other nightmare is that of a mirror. The two are not distinct, as it takes only two facing mirrors to construct a labyrinth. I always dream of labyrinths or of mirrors. In the dream of the mirror another vision appears, another terror of my nights, and that is the idea of the mask. Masks have always scared me. No doubt I felt in my childhood that someone who was wearing a mask was hiding something horrible. These are my most terrible nightmares: I see myself reflected in a mirror, but the reflection is wearing a mask. I am afraid to pull the mask off, afraid to see my real face.