Pretty cool. I've experienced a similar type of synaesthesia but it was based on rhythmic patterns for me. For instance, I was listening to a song that was in 3

Pretty cool. I've experienced a similar type of synaesthesia but it was based on rhythmic patterns for me. For instance, I was listening to a song that was in 3/4 or 6/8 or something, and I saw a really distinct triangle pattern. And then the album changed to 4/4 and became more of a square.