A four-dimensional impossible triangle

My book! A Guide to Making Friends in the Fourth Dimension: https://tibees.com/ This video is based on a 1978 article by Scott Kim titled An Impossible Four-Dimensional Illusion. It was published in the book Hypergraphics by David Brisson. I read it in the Hypergraphics book and have not found an open access online verison of the article. Here are a list of libraries that stock hypergraphics: https://search.worldcat.org/title/1109796884 This website provides PDF nets of the shapes needed to construct the model (which I found after I made mine oops): https://www.cutoutfoldup.com/1125-impossible-4-d-quadrilateral.php Scott Kim's website: https://www.scottkim.com/ Stack exchange post with comment from Scott Kim: https://math.stackexchange.com/questions/355251/optical-illusion-in-4d Scott Kim is also on YouTube https://youtu.be/Pz616L1D5fc?si=1AFe2J-fFqtxw-M8 Support this channel with a monthly pledge on Patreon: https://www.patreon.com/Tibees Buy me a coffee (one-off donation): https://ko-fi.com/tibees Website: https://tobyhendy.com TikTok: https://www.tiktok.com/@tibees Twitter: https://twitter.com/TobyHendy Second channel: @tibees2 Editing by Noor Hanania