Accidentally amazing

I was trying to make something that would interpolate between 4 pixels in each corner of a square, such that there would end up being a smooth gradient between all of them. I see what one of my mistakes was, but it led me to this sort of... thing.
Dunno what you'd call it. I made some adjustments to capitalise on its potential since the original version, allowing for multiple focal points that aren't always on the corners (although sometimes you couldn't tell where they were anyway). I'll post screens of that later, and maybe the program itself if you want it.