3 x disparition
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This is the final test: does grey circular samples made of bright colors and their grey surroundings made of black lines appear the same, or: visually equivalents. In other terms: do the color-made samples disappear?
It works quite well for these 3 first ones. 5 to go with the opposite problem: black-made samples, colored-lines made surroundings…
After this the question could be: what is the exact distance at which such optical colors mixtures become a “color field,” and how to know (calculate, predict…) it?