I just spent 30 minutes trying to get any of these examples to work before it clicked.
What worked for me: I’m not “crossing my eyes.” Trying to cross my eyes precisely enough to get the two images to overlap was impossible.
Instead I’m starting by crossing my eyes until a third out of focus image starts to appear between the other two images, then I immediately abandon trying to cross my eyes and instead focus on bringing that third image into focus like it’s “floating” in the room at a different point in space than the page its on.
Apparently the circuits in my brain and eyes are good at this. As soon as I can get the “third image” to show up by crossing my eyes, I can “look” at it and my eyes snap perfectly into position.
After about 5 minutes of practicing I can focus on the third image in about a second from the time I begin to cross my eyes.
On the third image, the differences between the two images “shimmer” like a holographic foil on a playing card.
What worked for me: I’m not “crossing my eyes.” Trying to cross my eyes precisely enough to get the two images to overlap was impossible.
Instead I’m starting by crossing my eyes until a third out of focus image starts to appear between the other two images, then I immediately abandon trying to cross my eyes and instead focus on bringing that third image into focus like it’s “floating” in the room at a different point in space than the page its on.
Apparently the circuits in my brain and eyes are good at this. As soon as I can get the “third image” to show up by crossing my eyes, I can “look” at it and my eyes snap perfectly into position.
After about 5 minutes of practicing I can focus on the third image in about a second from the time I begin to cross my eyes.
On the third image, the differences between the two images “shimmer” like a holographic foil on a playing card.