Tetrahedral rack motion. Not exactly sure how this would be useful, but it is cool to look at.
<video controls autoplay loop>
<source src="https://diqn32j8nouaz.cloudfront.net/tetrahedral_rack_motion.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
https://www.homemadetools.net/forum/...446#post131722
https://www.homemadetools.net/forum/...3224#post98386
https://www.homemadetools.net/forum/...1633#post74805
https://www.homemadetools.net/forum/...3577#post99487
https://www.homemadetools.net/forum/...3165#post98278
https://www.homemadetools.net/forum/...7842#post86354
