The first set are (as the text says) designed for cross-eyed viewing, the others for parallel. These use opposite left/right arrangement. So if it feels like half of them are backwards, you are maybe using the same viewing method for both sets?
I just went back and doubled checked, and they're all correct. If they look inverted, you are probably diverging your eyes ("parallel view") instead of crossing them. If that's more comfortable for you there is a section of images arranged with that orientation at the end of the article.
Came to say the same. Depth is inverted for me. Is it because instead of looking at each picture with the eyes straight, we cross them (and each sees the opposite picture)?
Heh I thought you must've tested these on a teeny tiny monitor to make them work. No wonder! But of course when crossing eyes there is essentially no limit. Thanks for the clarification.