Very cool!

If you're just learning about the Wallpaper Groups from this and feel like you've seen them before, it is probably from the work of MC Escher [0].

If you want a great recent survey, an episode of (the inimitable and now restarted) In Our Time from last month goes into the friendship / mutual influence of Escher and Coxeter. [1]

[0] https://eschermath.org/wiki/Regular_Division_of_the_Plane_Dr...

[1] https://www.bbc.com/audio/play/m002v19c