Imagination has its foundation in an unfulfilled possible reality. The key word here is 'possible'.
Fantasy has its foundation on an undeserved / unearnable reality.
Most often we confuse fantasy for ambition & extrapolation for imagination. That leaves us with one question - creativity.
Creativity is augmenting what's already present, and having the curtosy to give credit to what has been, and taking credit for what is been augmented.
Sent on my BlackBerry® from Vodafone Essar