Couldn't really figure out what category these should go in so they ended up here, feel free to move if there is a better category.
I only discovered these yesterday, to see them in 3D you need to cross your eyes, getting kind of close to the screen then moving back helped me figure it out, you should see a 3rd image in the middle of the left and right images which you can focus on and becomes 3D... It's wierd at first but once you get used to it 3D really is great