Sensitive epileptic people should CLOSE immediately this BLOG! This kind of animation may trigger an epileptic attack.
This kind of animation may be automatically produced with adequate software or via HTML programming. I used Stereo Photomaker 64, a freeware that may be found in internet. To make this, I used three versions of one photo, in one of them I cut a little at the borders to look closer. The image presents thus 3 pics in sequence, the original, the negative of the original and the original that was cut. The time duration of each pic is measured in miliseconds, 20 ms for original and closer image but just 1 ms for the negative one.