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I let out a verbal "what the fuck" when I tried this. Same exact thing as you, it's absolutely striking.
I was confused as well. First impression: nothing. Get up and look with both eyes and there it was. Interesting stuff.
I was in bed reading this with an eye closed and was very confused until I discovered the illusion works for me only when I watch it with both eyes open. I found this surprising—I know three dimensional optical illusions depend on focus and perspective, but I was unaware two dimensional optical illusions were as well.
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So you can see it with zero eyes open? ;) I also see it with any number (>= 1) of eyes open and at any angle. Wonder if GP's phone was on night shift or something similar - the article mentions that color changes impact the illusion's visibility.
No night shift, for what it’s worth. Another commenter mentioned astigmatism, which I do have. I was not wearing my glasses at the time. Curious to see if anybody with expertise on the topic of optics or visual perception chimes in with some insight.
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Play with the color of the pigeons. Slide it all the way to black, and it's no longer an illusion - the edges really do move in steps. Slide it all the way to white and the same effect appears in the inverse. Somewhere in between, there are shades of gray where the smooth movement of the pigeons is visible. And there are shades of gray where your brain can't separate it from the underlying black motion. That's intere…
> Slide it all the way to black For the record: the illusion still works for me if I slide the color all the way to black. One eye, both eyes, it always works for me.
I don’t feel this is much of an illusion. I think you just can’t see the movement of gray on black. Or maybe this is what illusions are in a very simple form?
I'm confused what you think an illusion is?
This just relies on poor contrast.
I don’t feel this is much of an illusion. I think you just can’t see the movement of gray on black. Or maybe this is what illusions are in a very simple form?
If the illusion is an error, what maximizes it?