In Plato's allegory of the cave, a number of prisoners have been imprisoned since childhood in a cave, chained so they cannot move, nor turn their heads, so that all they can see before them are shadows on a wall, and all they can hear are echoes around the cave's walls, that they take to be coming from the shadows. These shadows and echoes they take to be real, for they have known only these ...

See my blog post: Suhrawardi’s Illuminationist Rescue Plan.