The Australian philosopher Frank Jackson devised a thought experiment to represent a Knowledge Argument in 1982.
Mary is extremely smart, she is educated on neuroscience to the point where she is an expert on the subject. Mary has read about everything there is to know about the perception of colour in the brain as well as the physical facts about how light works in order to create the different wavelengths and colours and about how the brain processes visual stimuli. She knows every scientific fact about what happens when we see colour.
Except, Mary herself has never seen a coloured object. A red strawberry, a brown chocolate, colourful m&m’s, the blue ocean, the yellow sun… Mary has never seen any of these!
Mary has lived her entire life in a black and white room. Her books are black and white, her hair is black, her T.V is black and white…
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