A fantasy may involve evil or monumental waste; in that case, if you acknowledge it, you can begin to shape it, tame it and put it in perspective. An unacknowledged fantasy, though it appears harmlessly buried, still works its power on your life through subconscious desires. Therefore, it is much healthier to open the door and face it.
In this experience you are going to allow yourself to live out a fantasy of your choice, within the safety and confinement of your imagination. It may be something incredibly good that you never had the power to do, or it may be something you could never allow yourself to act out.
Whatever you experience, you must remember that it will all be fantasy; it is not a part of your real world, nor will it ever have to be.