In 'Imagination,' Jean-Paul Sartre delves into the complex nature of human consciousness and its ability to form images. This seminal work, subtitled 'A Phenomenological Psychology of the Imaginary Consciousness,' offers a rigorous philosophical exploration of how imagination functions, distinguishing it from perception and memory. Sartre argues against the idea of mental images as distinct objects, instead proposing that imagination is a mode of consciousness itself, an act of 'nihilation' that allows us to posit what is not real. He critically examines various theories of imagination, presenting his unique and influential phenomenological approach that profoundly shaped 20th-century philosophy and psychology.