To place oneself in a real life scenario but imagine completely unrealistic outcomes.
To visualize a situation that is not within the realm of possibility.
My wife envisualized giving birth to a full term baby the size of a gulf ball, that slipped out with ease then grew to seven pounds in her arms.
When I envisualize asking my boss for a raise he tells me that, "a raise is not good enough for a fabulous worker like yourself." He then gives me a briefcase of cash.