Maybe, if you’re lucky, @Bathsheba will share how it was originally created? I seem to recall that model pre-dating Sub-d (at least in Rhino), but I might be wrong
-Jakob
Yes, my folder for it is dated 2004. I modeled the topology in Rhino, conditioned the mesh in Surface Evolver, and did the texture by writing command-line utilities in (are you ready?) Perl. If memory serves, putting the rims on was the fiddliest part.
It’s not difficult to imitate, especially now. My favorite take is at http://www.bugman123.com/Math/index.html#Homotopy . Those little animations explain the topology really well, and don’t miss the vertical image at left of a similar design on a hyperbolic ribbon – I liked that so much, I borrowed it back.