An example of something from fantasy is the White Rabbit from Lewis Carroll's "Alice in Wonderland". Because of our experience, that is, how we have lived our lives, it has not been proven that it can possibly be real. The White Rabbit is an animal which stands on two legs (in some stories), wears human clothing, and acts and speaks like a human. For us as humans, a normal rabbit does not speak, nor does it act or speak like a human. Because of that, we think of the White Rabbit as fantasy, it only can be living in a not-real world.