Tzvetan Todorov in his classic study of the fantastic, The Fantastic: A Structural Approach to a Literary Genre once defined it this way:

Which brings us to the very heart of the fantastic. In a world which is indeed our world, the one we know, a world without devils, sylphides, or vampires, there occurs an event which cannot be explained by the laws of this same familiar world. The person who experiences the event must opt for one of two possible solutions: either he is the victim of an illusion of the senses, of a product of the imagination – and laws of the world then remain what they are; or else the event has indeed taken place, it is an integral part of reality – but then this reality is controlled by laws unknown to us.1

The fantastic occupies the duration of this uncertainty. Once we choose one answer…