I used to see “waves” when listening to music when I was younger, but it faded as I got older. Like they’d arch in certain directions depending on what I’d listen to. Like when you throw a stone into a still pond.
They wouldn’t be a particular colour, more a distorting of the surrounding.
I used the Synesthesia field for a bit, not long enough to see any effect I don’t think.
This field however, I’m a strictly monochrome kind of guy, all my artwork is black and white, I only wear black clothes etc. But, since listening to this field, I find myself incorporating more colour into content I produce, and my artwork.
I don’t feel the effect as strongly as the first week of using it, but I can tell it affects my cognition.