So, we ask, how do you know how long these poles should be as they
recede? I was taught, he says. Not by any formal teacher, but by casual
comments by friends and acquaintances. How do you know about shadows? He
learned that too. He confides that for a long time he figured that if an
object was red, its shadow would be red too. “But I was told it wasn't,” he
says. But how do you know about red? He knows that there's an important
visual quality to seen objects called “colour” and that it varies from
object to object. He's memorised what has what colour and even which ones
clash.
Via Jason Kottke,
Senses special: The art of seeing without
sight
An artist who can draw complicated scenes upon request, despite the rather
small handicap of being blind—a very interesting article indeed.
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