Time is linear. One thing happens, then another, then another. But while time itself may be linear, our memory of it is not. Of course we can order our memories in a linear, sort-by-date, fashion, but we can also sort by importance, by emotion and even (speaking as someone who grew up in the 1970s) by dodgy haircut. And since you are reading a literary magazine you, like me, can probably sort your memories by books – you can pick a book from your bookshelves, start to browse, and be magically transported not only to the world within the book, but also to the world you were living in when you first read it.