Just trying to get an idea of how folks "see" in game...lol
Outta of 36 responses dealing with the first picture in the first post...
Boxes 1-4: 16 /36 start seeing shades of grey here.
Boxes 5-8: 10/36 folks start seeing shades of grey here.
Boxes 9-12: 10/36 folks start seeing shades of grey here.
Couple saw complety black

they need a new monitor or to calibrate it properly.
It's all preference, but if you can see boxes 2-5 or shades near those number, with definite shape recognition around 6-8, then you're in the ball park.