ACTIVE IMAGINATION is not hypnosis, contemplation, or meditation (but all three).
Hypnosis (is) … the world of unconsciousness. Contemplation … sharpen(s) the mind's reasoning ability. Meditation asks us to move away from the dream world and our everyday mind through focusing on a single word, our breathing, or our movement...
Elements of all of these practices are touched upon when practicing Active Imagination.
But, Active Imagination relies upon an alert mind, the non-rational, and a high level of inner creative fludity...
Events that bring a person to relax their everyday awareness (e.g. listening to stories, watching the flames in a fireplace, listening to the sea) can move us into Active Imagination. From Mystical Experience Registry. See also Wikipedia and Jung Resources.