Many memory techniques involve creating unforgettable imagery in your mind's eye. That's an act of imagination. Creating really weird imagery really quickly was the most fun part of my training to compete in the U.S. Memory Competition.
I surrendered to a world of my imagination reenacting all those wonderful tales my father would read aloud to me. I became a very active reader especially history and Shakespeare.
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Reality is how we interpret it. Imagination and volition play a part in that interpretation. Which means that all reality is to some extent a fiction.