Anyone have any idea what software would have been used to produce this image?
Found it on Facebook with no attribute.
Wire frame graphics.
Many graphics software offer this.
Tie your knots with this stuff (nylon mesh tubes), and you don’t need a computer. 
Thanks Carol, that is what I call clever thinking.
Turns out that it is available over here in the UK as ‘Hollow Craft Nylon Mesh Tubing’, 30p per m.
I should have some here by next week to play with - I think the challenge though is going to be stopping my grandkids from making bracelets with it… Perhaps I shouldn’t have also ordered those magnetic endcaps.
Derek
Parameterization and Welding of a Knotbox.
Prof. Dr.-Ing. Daniel Loridick.
http://daniellordick.de/docs/Lordick-DMS-2011.pdf