Jason experiments with stereographic photography.
The effect is similar to those ‘Magic Eye’ things that were really popular a few years ago; one is supposed to cross their eyes and they’ll focus automatically on the intended object.
However – with the exception of the sample image with the blog post itself – when I tried, I hurt my eyes from the strain, and I couldn’t get any effect at all until I shrunk down Jason’s images to about half the size.
I guess my eyes just don’t cross as much as his.