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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.

Squarish rainbow

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.

  • What would be the question you want to ask exactly? – Wrzlprmft Jul 11 '15 at 9:46
  • @Wrzlprmft Why do we see lines where there is no actual lines there. – JeromeJ Jul 11 '15 at 9:57
  • @Wrzlprmft (what is the scientific explanation behind it) – JeromeJ Jul 11 '15 at 10:06
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There's a Cognitive Sciences site. Please note that it does not have many active experts.

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