These are cross-eye 3D images. That means the Right image in on the Left side, and vice-versa. Here is how you do it: First, choose photo viewing size = Large. Next, put your thumb bteween your face and the image, about a foot in front of your face, and focus on it. Gradually shift your gaze to the image behind your thumb. The two sides of the image should slowly fuse into one, in the middle. Gradually focus on that - it will be in 3D. Take it slow. Sometimes it helps to slightly tilt your head. It takes a little while to get the hang of it but once you do, it will be easy. Best viewing mode is SLIDESHOW.