This is a rabbit hole worth diving down... will keep you occupied through the next lock-down.

Home page;- Golden Mean Gauge


Carwow, best-looking beautiful cars and the golden ratio.



And if you want a challenge, to knock up a Golden Gauge... David Michael Wright: Make your own Golden Mean Gauge!

Dr. Levin's Golden Mean Gauges

another...
82 - How to Make Golden Ratio Calipers Golden Mean FREE PLANS - YouTube and this version:- https://www.youtube.com/watch?v=yxXI5a6B79s

Enjoy !