I'd be interested to hear whether anyone else here has experienced colour associations or physical sensations in response to everyday sounds. It seems we have a visual bias among the synesthetes here.

For instance, C major has always "felt" gold to me, perfect fifths and octaves give me a pleasant, involuntary tingling sensation in the crown of my head that emanates down my spine and radiates through my arms and legs (distinct from the notion of frisson/shivers).

What is to give light must endure burning.