In 1688, Molyneux posed this problem to Locke: Suppose that a congenitally blind man has learned to distinguish and name a sphere and a cube by touch alone. Then imagine that this man suddenly recovers his sight. Will he be able to distinguish both objects by sight and to say which is the sphere and which the cube? Locke answered,

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Locke argued that the man would not be able to immediately recognize the cube and the sphere by sight alone, because he had only learned to distinguish them by touch. Locke believed that sensory experiences are distinct and that learning to identify objects through one sense does not automatically grant the ability to identify them through another.

In 1688, Molyneux Posed This Problem to Locke: Suppose That