Knowledge argument
In philosophy of mind, the knowledge argument (also known as Mary's Room, Mary the Colour Scientist, or Mary the super-scientist) is a thought experiment proposed by Frank Jackson in his article "Epiphenomenal Qualia" (1982), and extended in "What Mary Didn't Know" (1986). The thought experiment describes Mary, a scientist who exists in a black-and-white world where she has extensive access to physical descriptions of color, but no actual perceptual experience of color.