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I don't always associate a track with color. But when I relax and close my eyes with headphones on, my mind does involuntarily paint a whole universe of colors and shapes inspired by the music. Well, Vivaldi's four seasons paints distinctly worldly scenes. But Beethoven paints very abstract things.

And I love music, but hate to have it playing if I'm trying to concentrate on anything else.

But I never thought myself synesthetic. Just plain introverted. So now I wonder if this type of "over-stimulation", or increased sensitivity, is somewhat shared between all introverts and people with synesthesia?