Look at a real image on a phone or something, do the thing where you divide your view into two pictures with your eyes, keep it that way and now focus on one of the split images.
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Jiehfeng
Jiehfeng
It looks like the elements of the picture has depth. If you can't get it, practice with these pictures, these ones are actual 3D ones. https://www.kula3d.com/how-to-use-the-cross-eyed-method For these, when you split the images, you need to align them close enough and then immediately focus on the alignment. Adjust your viewing distance to get it to work properly.
The Real Jdbye
It also works with YouTube 3D videos if you view them side by side.
Jiehfeng
Ah yes it should! I'll try that now. 
The Real Jdbye
You could watch 3D movies that way too, but it might hurt after a while.
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