‘By looking attentively at old and smeared walls, or stones and veined marble of various colours, you may fancy that you see in them several compositions, landscapes, battles, figures in quick motion, strange countenances, and dresses, with an infinity of other objects.  By these confused lines, the inventive genius is excited to new exertions’. These are the words of Leonardo da Vinci – from his ‘Treatise on Painting’. As this quote proves, the use of the accidental or incidental to spark imagination is nothing new and has been used by artists for centuries. If it was good enough to help Leonardo spark his creativity, then it’s good enough for me.…