Our imaginations can take us to the most far-flung places that our own minds can conjure up in terms of our desires. Returning home exhausted from the graveyard shift at the factory on a snowy morning, one very nearly collapses onto the sofa, heaves a sigh, closes ones eyes, and for a moment one has transported oneself to another reality altogether.

There are no more factories. It is warm and sunny. One is no longer in their under-employed mill town but rather on the sunny Mediterranean. Our sparsely furnished apartment has been transformed into a sleek yacht gently rocking as we happily survey our opulent domain.

Yet, moments later, something startles us back to reality and when we open our eyes we are right back where we were. Tired, concerned about our day to day existence and simply restless in general.

The above example is what is termed a