I'm kind of lost here, usually I do my search on my own first but here, idk, I don't even really know what I should type in Google to look for answer.
Basically, I got this image I generated myself and I noticed that our eyes/brain interprets/see two crossing diagonal lines.
But they do not exist. The way I generated this picture is, the inefficient way, by creating the outer square then overwriting them successively with smaller square of different colors. There is no line.
I think it might be due to proximity with other colors but I'm not sure.
Where should I ask this very question ideally?
EDIT: I got a bit inspired and search for "Brain perception lines illusion" but I haven't found my answer yet, plus I'd like an explanation on this very case if possible.