There is a game in here, I think. Not least in the process of marbling paper. Back when I was a kid I never thought about how this stuff came to be. But now I know: a tray of water with marbling ink dropped onto the surface. Different coloured inks are encouraged to mingle and swirl around one another with a stick or a needle. Then the paper is laid on top for sixty seconds or so. Wash the paper under running water – I imagine this bit’s a touch nervy – and then hang it to dry.