I just noticed that I can elect to pay attention to my breathing, or ignore it, but one or the other keeps happening. Changing which one I focus on changes the way I think. This is interesting.
This software used to make this image, Stella 4d, may be tried for free at http://www.software3d.com/stella.php. The “breathing” effect is optional with this program, and is created by having the software use a tight fit-to-frame in each still pic that composes this .gif file.