Before clicking I thought it was about flexhedra, but I got confused. But since there is seemingly no Wikipedia page for it here is a French video (subtitled, h

Before clicking I thought it was about flexhedra, but I got confused. But since there is seemingly no Wikipedia page for it here is a French video (subtitled, hopefully with a high enough quality) describing it briefly. https://www.youtube.com/watch?v=Kg3_gLO-reE https://www.youtube.com/watch?v=Kg3_gLO-reE