I was brought up believing that losing anything is Really Bad. I think this belief partly stemmed from a book that fascinated me when I was very small: Thomas Tidies His Room by Gunilla Wolde, in which Thomas loses his teddy and then tidies his room in order to ... well, I don't want to spoil the ending for you so I'll leave it there. But I remember getting increasingly anxious with each page turn, no matter how many times the book was read to me, as Thomas became more and