Why don't we find one and ask them? I reckon visualise is the exact word to use. How do you think blind people remember their way around places? It's certainly not through smell or sound! (and before some smartass says touch, blind people are perfectly capable of woalking through their houses without touching much at all) EDIT: Quick google: Caption: In one of Kennedy’s early studies a woman, blind from birth, drew this picture of a horse.