My maths object this time is one of my dog’s favourite toys: the Nobbly Wobbly.
In the video, I said it was invented by a mathematician, but Dick Esterle’s bio normally goes “artist, architect, inventor”. I’ll leave it up to you to decide if Everyone’s a Mathematician.
It’s a particularly pleasing rubbery ball thing made of six interwoven loops in different colours, invented by Dick Esterle.
On Google+, various people told me the unexpected fact that the outer automorphism group of
I’ve also found this Celebration of Mind livestream starring Dick Esterle from 2013 talking about all sorts of mathematically-shaped toys, including the Nobbly Wobbly.