On Friday I visited Chacarita Cemetery under a turbulent sky. Cameraless, as I went to look round with a friend. But now I have an excuse to share this photograph from almost five years ago. Friday was a full moon, so the timing seems right. I love inventing this beautifully Back-to-front world where a curve of stone inside a tomb becomes a hill – supporting the cross that’s behind me – and a fluke of light paints in a sapphire moon.