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Imagineering is picturing in your mind what you want to do or create and then introducing it into the real world. Simply create a mental image, in ideal form, of what you hope to see, remembering every detail; then, introduce the ideal into the real world.
Naturally, reality will hit you in the face. What is produced in the real world looks different from the ideal because the limitations of your capabilities to impose the ideal will soon surface. Some frustration, anger, and disillusionment often surface no matter how well the person performed imagineering.