Synesthesia is when two senses combine with each other and form relationships. For example, I have the most common kind: grapheme-color synesthesia. Mine looks like this. The only one that's supposed to be black is "1". Otherwise, the ones in black have no color associated with them.
Me too! Haha your color palette is so grating because the colors are all wrong to me 😅 Interesting that some of them don't have a color, is it really nothing at all or just not as strong of a connection?