What's it like having synaesthesia?

What's it like not having synaesthesia?

That sounds like a flippant answer, but it's quite the truth.  I can't remember a time when I didn't experience sounds (music, in particular) in a deep, visceral way that involved more than just my sense of hearing.  For the longest time I thought everybody's experience of life was like mine.  I thought everybody cried when they heard violin music.  I thought everybody felt waves of cold and prickles when they heard sounds made up of square waves (yeah, I'm dating myself, aren't I?)  Didn't everybody shiver and see starbursts of pink and purple …

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