The ancient Greeks said that the Golden Section was a rule of proportion that linked mathematics with beauty. Much of their architecture was designed according to this rule. I also included the Fibonacci Sequence, which directly relates to the Golden Mean. The Golden Section Mathematics Fibonacci by GeographicsArt on Etsy, $19.50
Fractal spiral, Fibonacci.
Golden spiral with golden triangle necklace- Fibonaci 24 Karat gold plated pendant- statement necklace by Delftia on Etsy https://www.etsy.com/listing/176225171/golden-spiral-with-golden-triangle