Animation of the family of shapes obtained by gluing a white and a yellow square along their boundaries. This animation is referenced by [Hull et al. 2022] as an example of quasi-twisting a doubly covered square along its perimeter.

[Hull et. al 2022] T. Hull, A. Lubiw, K. Mundilova, C. Nara, J. Tkadlec, and R. Uehara. “Quasi-Twisting Convex Polyhedra,” 34th Canadian Conference Computational Geometry (CCCG), 2022. [Full text]