I actually woke up in the middle of the night and said "A labyrinth!" Maybe the idea came to me in a dream, or maybe my subconscious was just chugging away in the background. But before I went to bed I showed my drawing to James and said I was thinking about a background/context visual. He suggested a snarl of knots, which didn't sit with me quite right. But obviously my brain continued thinking about it.
Villard de Honnecourt's drawing of the marble carving in Lucca, Italy. The labyrinth is a prehistoric image that can be found in almost all cultures. A very famous one can be found in Chartres Cathedral but I wanted to distance myself a wee bit from the church.