Rules

When she went round to Marnie's house they played a game where you twisted sections of a crystal tower to make gems fall down into a treasure chest. There were rules, but Marnie wouldn't let her see them. They always had to play just twisting and twisting until all the jewels fell, and then putting them back into the tower again. One day, when she was grown and made her own rules, she found a set, with all the gems accounted for. But the instructions were not with it. She could only twist and twist.