That sounds simple enough to me, and it might even seem simple to you on paper, but in practice, describing what I see is harder than it sounds. Try to explain the color red to someone who was born blind and you'll see why -- it's incredibly difficult to wrap your head around the concept of a sense you don't have. My associator status doesn't help, because anyone who's been to college knows about tasting purple, but it's a bit harder to explain why the letter A is red even if it's black. But I'm gonna try. It involves Gilbert Gottfried.
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A man of many talents, none of which are "softly rocking his children to sleep."
Stay with me, here. After an unfortunate lifetime of Disney parrots and Aflac commercials, you can probably re-create Gottfried's voice in your head, right? Are you doing it right now? I'm sorry, I accept full responsibility for that. Associative lexical synesthesia is basically like that -- just because Gottfried isn't screeching in your ear right now doesn't mean you can't hear him. Sight-to-sound synesthesia is kind of like that scene in Fantasia where the soundtrack is shown as a straight line that changes color and shape as different instruments produce different sounds. That scene sucks, though, because those colors are all wrong. Oh, by the way ...