Drawing an analogy with Magritte's painting ('Ceci n'est pas une Pipe'), this talk attempts to explore the relationship between physical reality and the theoretical structures of physics. A distinction will be drawn between the behaviour of physical objects and the theories that describe this behaviour: It will be suggested that, at least in classical physics, a theory is analogous to a map - not the thing itself, but a source of information that has a one-to-one correspondence with every aspect of it. We shall attempt to extend the map analogy to quantum physics, where we shall find that it has to be replaced by a 'map book', each of whose pages describe a set of 'consistent families' made up of 'histories'; each history within a given family has a probability of representing reality. To apply quantum physics to any particular physical situation, we chose the page that is appropriate to the particular context; this may change during the evolution of a physical process and we shall consider how this concept may be used to resolve some of the standard conceptual problems of quantum physics. The talk will end with a short discussion of how the concept of 'memetics' may be applied to assess the truth values of different interpretations of quantum physics.
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