It is Saturday, Carl, Danny and Anna are going to town with Mummy. They are taking a broken watch to the watchmaker, they want to look at some books in the bookshop and they want to buy some new shoes. Carl is happy because he knows that the following day, Sunday, he will be able to wear his new shoes and that on his day in town, he has learnt a lot about how we measure time in weeks, months, years and long or shorter periods of time.