Jon Udell: Audio synaesthesia:

"After listening to a bunch of podcasts on long bicycle rides this summer, I've noticed a weird synaesthesia effect. When I first listened to Jim Gray's discussion of asynchrony I was at mile 23 of this route. When I listened to it again and transcribed the quote for my blog, I saw that landscape again. It works the other way too. If I repeat a route, I remember what I heard along the way."