Thanks! It was actually inspired by rvaiya's warpd [0] which has a similar grid mode but with quadrants instead.

I thought that needing to choose out of four quadrants at once is a bit overwhelming on cognitive load for something that is meant to be a subconscious extension of your hands, so instead I just unified it with the arrow keys as a "shrink in this direction" choice rather than "choose one of four quadrants".

Changing it to bisection/binary partitioning also means that don't need any visual aids as it's exceedingly simple to see which edge your target is the closest to.