So. You get to the cafe, put in your order and find a seat. At the Bean Barn, tables lines the left-hand side of the building. Small, cosy. On the table you see a tiny china tea-cup and saucer. In it are a couple of mini pencils, a brown paper bag and, held in a clamp, a folded piece of card: instructions for the poetry challenge. You have one week to figure it out.