Crosslinkage
I was trying to make a function that would be able to indicate the correlation of two keywords to one another over the volume of youtube comment posts. That is, if 50% of comments contained the word “awesome” and 50% of the comments contained the word “lol”, then it would be expected for about 25% of the posts to contain both. I decided that green should indicate “about expected” correlation, cyan “above average”, blue “very high”. On the other side, I would choose yellow for “below average”, and red for “very low.” 
Messing about in paint, I figured out where I wanted my red, green and blue values to move in and out, and once I had those states working I would interpolate between them.
just another gradient
The colours didn’t work out properly at first, but it I like the gradient here anyway. It’s interesting when the mistakes look as nice as the successes.
This is the state of the links in the youtuber as of today. the colours here are for values between 0.25 and 6… because the function is piecewise, nothing interesting happens past 2.0… it was gratifying to get it working though.