A mental image is an experience that, on most occasions, significantly resembles the experience of 'perceiving' some object, event, or scene, but occurs when the relevant object, event, or scene is not actually present to the senses.There are sometimes episodes, particularly on falling asleep (hypnagogic imagery) and waking up (hypnopompic), when the mental imagery, being of a rapid, phantasmagoric and involuntary character, defies perception, presenting a kaleidoscopic field, in which no distinct object can be discerned.Mental imagery can sometimes produce the same effects as would be produced by the behavior or experience imagined. “I am sitting in one of the bright rooms of my mind. Everything I do and will do in my hands has cause and effect. It helps me understand. And all this is crushed under the clarity of the endless sea that lies before me. Is it the sea? Yes, I guess I should show you there too.”

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