Effectively if object must be spherical... :)

so use Flow at the end of the process for round it ;)

Modelled completely in Moi3d. It was an exercise to fill in some lockdown time.
If I remember rightly I used Matrix to render that one, but these days I use Light Tracer Render for pretty much everything :)

Yes I started by tracing some close-ups of the Sutton Hoo Treasure - I've had to do quite a lot of Celtic knotwork before; once you figure out the logic of the pattern it'seasy :)

http://www.entrelacs.net/

Great resource - thanks Pilou :)