🌈
I found sonoluminescence interesting – reference wikipedia from a link, because, it can be colour caused by the implosion (inwards collapsing explosion) of a bubble by sound. Could this be what causes the feelings of synesthesia? Music changing the properties of our brain fluids and releasing colourful thoughts in our mind when we are wearing headphones?
JAT (just a thought)
Technoverté / Clear / An Alibi 