"Jane makes the analogy that dementia is like a bookcase. The bookcase is packed with thousands of books – each one a memory. The bottom shelf, the one that is perhaps the sturdiest, is your childhood. This is safest from swaying when dementia 'hits' and starts knocking all the books off and jumbling them up. The top shelf is the one with the most recent memories – those from half an hour ago and so on. These are the books that fall the quickest when dementia strikes."