The first act of the Trickster Hermes - using the shell of a tortoise “accidentally” stumbled over at the threshold of his cave - is to create the world’s first lyre. At the mouth of the cave, where the innerworld and the outerworld meet, there, in the synesthesia of liminality - at the spatiotemporal limit - the unforeseen present itself and the mythopoetic imagination was born.
Deardorff, Daniel. The Other Within: The Genius of Deformity in Myth, Culture and Psyche. Ashland, Or: White Cloud Press, 2004, p. 119