Wow, that really is interesting, never heard of that either. I wonder if that's the simple difference between people who dream in color or black and white... a slight case of synesthesia...
Incidentally my brain is excruciatingly visual. For example, in school, I barely scraped off with a bottom dwelling B in algebra I and II. Geometry, however, was an A+ for me.
Where in the nursery rhyme does it say Humpty Dumpty is an egg?