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Thanks, I understand how stereograms work and have quite a few of these IRL. I use cross-eyed method to quickly view them (albeit inverted depth) when shown on screen.

I've tried to show my point in these videos which show basically no difference between the two images when overlapped and crossfaded between the two. https://imgur.com/a/RMy3QA3

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I agree that particular image is a dud; I was not able to perceive any depth.

The creator mistakenly used the same image twice.

The two men in a tent image is likewise a dud. If we look at the pole at the tent entrance, there is no difference in parallax between that and objects at the back wall.

The Abe Lincoln doesn't pop out much for me.

The dead soldiers in the field also seems to be identical images.

The clearly genuine ones are the horse-drawn carriage in the forest, and the horseman in front of the cannon.

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