https://www.scientificamerican.com/article/illusory-color-andamp-the-brain-2008-05/
ref - https://www.reddit.com/r/todayilearned/comments/e2r74m/til_colours_dont_actually_exist_they_are_a/
origin - https://www.pipiscrew.com/?p=16053 illusory-color-the-brain