could this be proof youtube its stereoscopic

[winny]

At the end of the day vision is a very very subjective thing.

The actual image on your retina is a lower resolution than you 'see', your brain fills in the rest. If your brain fills it in wrong then anything can hapen!

Anyyone who has had any sort of strong hallucination, chemically or mentally induced, will tell you that sometimes you literally can't believe your eyes. And there are 1,000's of illusions that prove this.

What you're doing by crossing your eyes is confusing your brain. It's still trying to compose the image but it can't make sense of the images it's seeing, so it fills in incorrectly. So, you get an optical illusion.

I think that's what you're doing by crossing your eyes, creating optical illusions, not unlocking some aincient long forgotten superhuman power. Human eyes are very easily tricked.