" It is a machine which I invented, designed and built. It is a way of gaining access to a variety of realities. As I say, at the moment it leads to a world created from Henry’s imagination.’ ‘Does he know?’ ‘No, and I’d prefer it if you didn’t tell him. He might be offended.’ ‘What do you mean by variety of realities?’ ‘It means that for any given state of the universe, there are an infinite number of other possibilities. For example, we came to this restaurant and you ordered chicken. You could have ordered fish. A universe where you did order fish is a viable alternative to this one. One where you ordered roast Brontosaurus is more distant and more difficult to access.’ Rosie’s "

― Iain Pears , Arcadia