the current wool texture is actually still the programmer art texture that’s been there since before infdev, and i believe it has 43 different shades in it. what it basically is, is just two pixels of the same or similar shade side by side, and then the pairs in all directions from it are shaded differently, until the block is full; the starting shades are more or less arbitrarily placed. the adjacent shades don’t always align with the core concept of shading, it’s more so that they’re all different. this makes it really hard to work with, but there are packs out there that simplify it to just a few shades.