Wow, I deeply remember seeing these patterns in my relatively early computing days. I think it primarily was in Windows 3.x, back when graphics modes with 16 co

Wow, I deeply remember seeing these patterns in my relatively early computing days. I think it primarily was in Windows 3.x, back when graphics modes with 16 colors were still normal. It definitely was not Floyd-Steinberg or anything else using error diffusion (which however I also remember seeing in those days, from some Windows applications' splash dialog for example), because there were these very characteristic stable patterns. During countless hours staring at the dithered blue gradient of InstallShield, for example.