This is my version of @nakakotv 's one costume 4x4 Single Stamp Grid Filler (SSGF) https://scratch.mit.edu/projects/1310850681/. His clever idea was to solve the challenge of fisheye and whirl not touching the corner pixels, by targeting a 6x6 but constrain the outer 1px margin be transparent. By using my extremely optimised simulated annealing algorithm, I found a costume which is 360x360 with whirls in range +-16k. No direction needed.
